4-letter words beginning with o

Answer 1

Some 4-letter words that start with O:

oaks

oaky

oars

oast

oath

oats

obey

Oboe

odds

odes

odor

offs

ogle

ogre

oils

oily

oink

okay

Okra

oleo

olio

omen

omit

ones

only

onto

onus

onyx

ooze

opah

opal

open

opts

opus

oral

orca

orgy

otic

ouch

ours

oust

oval

oven

over

ovum

owed

ower

owes

owls

owns

oxen

Oars, oath, obey, oboe, odds, oily, oink, okay, omen, omit, once, only, onto, open and ouch are 4 letter words. Additional words include ours, outs, oval, oven, over, owed, owls, owns and oxen.

4 letter words O: * oath * over * oven * only * onyx * ooze * oven * omit * odor * oboe * ovum * open * odds * omen * oily * ocra * opal * opus * oral * oryx * ouch * ooze * owes * owns
oval, open, owls, olay, oats, only
onus
* opus * oven * over * oval * oxen * only * orgy * omit * oath * ogle * oars * odds * obey * oboe * onto * odor * ogre * oily * okra * omen * open * oral * ouch * ours * oust
open.order.option,other
Four letter words beginning with O are:

• ogre
• okra
• oleo
• omen
• once
• onus
• opal
• open
• orca
• ouch
• oust
• oval
• oven
• over
• ovum

A four letter word starting with an "o" is: OVER
opal open obey obit oboe odor odds okra olio omit omen only onto onyx onus ooze oozy opus oral orca ouch oryx oust ovum oxen over oval oven

oaks

oars

oast

oats

obis

odds

odea

odes

odor

offs

ogre

oils

oink

okay

oleo

olio

omen

once

only

onto

onus

onyx

oops

ooze

opah

opal

open

opts

opus

oral

orbs

orca

orcs

ores

orts

otic

ouch

ours

oust

outs

oval

oven

over

ovum

owes

owed

ower

owls

owns

oxen

oxer

Answer 2

None in English, I'm sure.
Bookkeeper is the only one I know that has 3 doubles in sequence.
The Australian town Wooloomooloo has four doubles - does that count?
Bookkeeper is an excellent start. But what if they are one of a few bookkeepers? They would then be a ... Subbookkeeper. This as 4 doubles in a row.

If you want a word with 4 double S then what about Possessionlessness.

Answer 3

Oafs, oaks, oars, oath, oats, obey, obis, oboe, odds, odor, ogle, oily, oink, okay, okra, oleo, omen, omit, once, only, onto, onus, onyx, ooze, open, oral, orgy, ouch, ours, oust, outs, oval, oven, over, owed, owls, owns and oxen are 4 letter words. They begin with the letter o.

Answer 4

Oaky, Oast, Oath, Obey, Oboe, Odds, Odor, Ogle, Ogre, Ohio, Oily, Oink, Okay, Omen, Omit, Once, Only, Onto, Onyx, Ooze, Opal, Open, Opus, Oral, Orca, Orgy, Orzo, Ouch, Oust, Oval, Oven, Over, Ovum, Oxen.

Answer 5

• boo
• coo
• door
• flood
• goose
• hoof
• igloo
• loop
• mood
• noon
• oodles
• ooze
• poodle
• room
• stoop
• swoop
• took
• wood
• zoo
• zoom

Answer 6

3-letter words

boo, coo, goo, loo, moo, noo, ooh, oot, too, woo, zoo

4-letter words

book, boom, boon, boor, boos, boot, broo, coof, cook, cool, coon, coop, coos, coot, doom, door, food, fool, foot, good, goof, gook, goon, goop, goos, hood, hoof, hook, hoop, hoot, kook, loof, look, loom, loon, loop, loos, loot, mood, mool, moon, moor, moos, moot, nook, noon, oohs, oops, oots, ooze, oozy, pood, poof, pooh, pool, poon, poop, poor, rood, roof, rook, room, root, shoo, sook, soon, soot, took, tool, toom, toon, toot, wood, woof, wool, woos, zoom, zoon, zoos

5-letter words

aboon, achoo, afoot, aloof, baboo, bazoo, bhoot, blood, bloom, bloop, booby, booed, boogy, books, booms, boomy, boons, boors, boost, booth, boots, booty, booze, boozy, brood, brook, broom, broos, cloot, cooch, cooed, cooee, cooer, cooey, coofs, cooks, cooky, cools, cooly, coomb, coons, coops, coopt, coots, crook, croon, dooly, dooms, doors, doozy, drool, droop, flood, floor, foods, fools, foots, footy, gloom, goods, goody, gooey, goofs, goofy, gooks, gooky, goons, goony, goops, goopy, goose, goosy, groom, hooch, hoods, hooey, hoofs, hooka, hooks, hooky, hooly, hoops, hoots, hooty, igloo, karoo, kazoo, kloof, kooks, kooky, kroon, looby, looed, looey, loofa, loofs, looie, looks, looms, loons, loony, loops, loopy, loose, loots, mooch, moods, moody, mooed, moola, mools, moons, moony, moors, moory, moose, moots, nooks, noons, noose, oohed, oomph, oorie, ootid, oozed, oozes, pooch, poods, poohs, pools, poons, poops, poori, proof, roods, roofs, rooks, rooky, rooms, roomy, roose, roost, roots, rooty, scoop, scoot, shook, shool, shoon, shoos, shoot, sloop, snood, snook, snool, snoop, snoot, sooey, sooks, sooth, soots, sooty, spoof, spook, spool, spoon, spoor, stood, stook, stool, stoop, swoon, swoop, taboo, tools, toons, tooth, toots, troop, trooz, vroom, wahoo, whoof, whoop, woods, woody, wooed, wooer, woofs, wools, wooly, woops, woosh, woozy, Yahoo, zooid, zooks, zooms, zoons

6-letter words

abloom, ahchoo, aswoon, babool, baboon, baboos, bamboo, bazoos, befool, behoof, betook, bhoots, bloods, bloody, blooey, blooie, blooms, bloomy, bloops, boobed, booboo, boodle, booger, boogie, boohoo, booing, booked, booker, bookie, boomed, boomer, boosts, booted, bootee, booths, bootie, boozed, boozer, boozes, brooch, broods, broody, brooks, brooms, broomy, burgoo, cahoot, cashoo, choose, choosy, cloots, cocoon, coocoo, cooeed, cooees, cooers, cooeys, cooing, cooked, cooker, cookey, cookie, cooled, cooler, coolie, coolly, coolth, coombe, coombs, cooped, cooper, coopts, cootie, crooks, croons, cuckoo, dahoon, dewool, dhooly, dhoora, dhooti, doodad, doodle, doolee, doolie, doomed, doozer, doozie, drools, droops, droopy, enroot, floods, flooey, flooie, floors, floosy, floozy, foodie, fooled, footed, footer, footie, footle, footsy, foozle, gaboon, galoot, glooms, gloomy, goober, goodby, goodie, goodly, goofed, googly, googol, gooier, gooney, goonie, gooral, goosed, gooses, goosey, grooms, groove, groovy, haboob, halloo, holloo, hooded, hoodie, hoodoo, hooeys, hoofed, hoofer, hookah, hookas, hooked, hooker, hookey, hookup, hoolie, hooped, hooper, hoopla, hoopoe, hoopoo, hoorah, hooray, hootch, hooted, hooter, hooves, igloos, indoor, karoos, karroo, kazoos, kloofs, koodoo, kookie, krooni, kroons, lagoon, looeys, loofah, loofas, looies, looing, looked, looker, lookup, loomed, looney, looped, looper, loosed, loosen, looser, looses, looted, looter, maroon, mooing, moolah, moolas, mooley, mooned, moored, mooted, mooter, noodge, noodle, noosed, nooser, nooses, oocyst, oocyte, oodles, oogamy, oogeny, oohing, oolite, oolith, oology, oolong, oomiac, oomiak, oompah, oomphs, oorali, ootids, oozier, oozily, oozing, phooey, poodle, poohed, pooled, pooped, poorer, pooris, poorly, proofs, racoon, ratoon, rebook, recook, reroof, retook, retool, roofed, roofer, rooked, rookie, roomed, roomer, roomie, roosed, rooser, rooses, roosts, rooted, rooter, saloon, saloop, school, scoops, scoots, scroop, shnook, shooed, shooks, shools, shoots, simoom, simoon, skidoo, sloops, smooch, smooth, snoods, snooks, snools, snoops, snoopy, snoots, snooty, snooze, snoozy, sooner, sooted, soothe, sooths, spoofs, spoofy, spooks, spooky, spools, spoons, spoony, spoors, stooge, stooks, stools, stoops, strook, swoons, swoops, swoosh, taboos, tattoo, tooled, tooler, tooted, tooter, tooths, toothy, tootle, tootsy, troops, tycoon, uncool, unhood, unhook, unmoor, unroof, unroot, uproot, varoom, voodoo, vrooms, wahoos, whoofs, whoops, whoosh, wooded, wooden, woodie, woodsy, wooers, woofed, woofer, wooing, wooled, woolen, wooler, woolie, woolly, yahoos, zooids, zoomed, zoonal

7-letter words

aloofly, babools, baboons, balloon, bamboos, barroom, bassoon, baywood, bazooka, beblood, bedroom, befools, begloom, behoove, bigfoot, blooded, bloomed, bloomer, blooped, blooper, bogwood, boobies, boobing, boobish, booboos, boodled, boodler, boodles, boogers, boogied, boogies, boohoos, bookend, bookers, bookful, bookies, booking, bookish, booklet, bookman, bookmen, boombox, boomers, boomier, booming, boomkin, boomlet, boonies, boorish, boosted, booster, bootees, bootery, booties, booting, bootleg, boozers, boozier, boozily, boozing, boxwood, boyhood, bradoon, bridoon, brooded, brooder, brooked, broomed, buffoon, bugaboo, burgoos, caboose, cahoots, cardoon, carpool, cartoon, cashoos, cheroot, chinook, chooser, chooses, choosey, cocoons, cooches, cooeyed, cookers, cookery, cookeys, cookies, cooking, cookout, coolant, coolers, coolest, coolies, cooling, coolish, coolths, coombes, cooncan, coontie, coopers, coopery, cooping, coopted, cooties, crooked, crooned, crooner, cuckoos, dagwood, dahoons, daybook, dayroom, dewools, dhooras, dhootie, dhootis, disroot, dogwood, doodads, doodled, doodler, doodles, doolees, doolies, doomful, dooming, doorman, doormat, doormen, doorway, doozers, doozies, dragoon, drooled, drooped, dyewood, eftsoon, enroots, epizoon, eyehook, festoon, finfoot, flooded, flooder, floored, floorer, floosie, floozie, foodies, foolery, fooling, foolish, footage, footboy, footers, footier, footies, footing, footled, footler, footles, footman, footmen, footpad, footsie, footway, foozled, foozler, foozles, forsook, gaboons, gadroon, galloon, galloot, galoots, gloomed, godhood, godroon, goobers, goodbye, goodbys, goodies, goodish, goodman, goodmen, goofier, goofily, goofing, googols, gooiest, goombah, goombay, gooneys, goonies, goopier, goorals, goosier, goosing, gossoon, groomed, groomer, grooved, groover, grooves, gumboot, gumwood, gunroom, haboobs, halloos, harpoon, hencoop, holloos, hooches, hoodies, hooding, hoodlum, hoodoos, hoofers, hoofing, hookahs, hookers, hookeys, hookier, hookies, hooking, hooklet, hookups, hoopers, hooping, hooplas, hoopoes, hoopoos, hoorahs, hoorays, hoosgow, hooters, hootier, hooting, hotfoot, indoors, inkwood, jargoon, jibboom, karroos, kerchoo, koodoos, kookier, lagoons, lampoon, lardoon, lawbook, legroom, logbook, logwood, loobies, loofahs, lookers, looking, lookout, lookups, looming, looneys, loonier, loonies, loopers, loopier, looping, loosely, loosens, loosest, loosing, looters, looting, madzoon, manhood, maroons, matzoon, midnoon, miscook, mistook, monsoon, mooched, moocher, mooches, moodier, moodily, moolahs, mooleys, moonbow, mooneye, moonier, moonily, mooning, moonish, moonlet, moonlit, moonset, moorage, moorhen, moorier, mooring, moorish, mooters, mooting, mudroom, nonbook, nonfood, nonpoor, noodged, noodges, noodled, noodles, noonday, nooning, noosers, noosing, nutwood, oocysts, oocytes, oodlins, oogonia, oolites, ooliths, oolitic, oologic, oolongs, oomiack, oomiacs, oomiaks, oompahs, oophyte, ooralis, oosperm, oospore, ootheca, ooziest, outcook, outdoor, outfool, outfoot, outlook, outroot, oxblood, palooka, pandoor, papoose, partook, patroon, platoon, plywood, pontoon, pooched, pooches, poodles, poohing, pooling, pooping, poorest, poorish, pothook, preboom, precook, precool, prenoon, proofed, proofer, puccoon, raccoon, racoons, ratoons, rattoon, rebloom, rebooks, recooks, redroot, redwood, reflood, regroom, reproof, reroofs, reshoot, retools, rockoon, roofers, roofing, rooftop, rookery, rookier, rookies, rooking, roomers, roomful, roomier, roomies, roomily, rooming, roosers, roosing, roosted, rooster, rootage, rooters, rootier, rooting, rootlet, rubaboo, saloons, saloops, sapwood, schmoos, schnook, schools, scooped, scooper, scooted, scooter, scrooch, scrooge, scroops, seaboot, seafood, shadoof, shampoo, sheroot, shmooze, shnooks, shoofly, shooing, shooled, shooter, simooms, simoons, skiddoo, skidoos, skookum, skyhook, smoochy, smooths, smoothy, snooded, snooked, snooker, snooled, snooped, snooper, snooted, snoozed, snoozer, snoozes, snoozle, sonhood, sooners, soonest, soothed, soother, soothes, soothly, sootier, sootily, sooting, spoofed, spoofer, spooked, spooled, spooned, spooney, spoored, squoosh, stooged, stooges, stooked, stooker, stooled, stoolie, stooped, stooper, subcool, sunroof, sunroom, swooned, swooner, swooped, swooper, tabooed, talooka, tandoor, taproom, taproot, tattoos, tearoom, testoon, tomfool, toolbox, toolers, tooling, tooters, toothed, tooting, tootled, tootler, tootles, tootses, tootsie, trooped, trooper, tsooris, tycoons, typhoon, unhoods, unhooks, unloose, unmoors, unroofs, unroots, unwooed, uproots, upshoot, upstood, vamoose, vanpool, varooms, voodoos, vroomed, webfoot, whoofed, whooped, whoopee, whooper, whoopla, whoosis, witloof, woodbin, woodbox, woodcut, woodhen, woodier, woodies, wooding, woodlot, woodman, woodmen, woodsia, woodwax, woofers, woofing, woolens, woolers, woolhat, woolier, woolies, woollen, woolman, woolmen, woomera, woopsed, woopses, woorali, woorari, wooshed, wooshes, woozier, woozily, zooglea, zooidal, zoology, zooming, zootomy

8-letter words

agalwood, airproof, alumroot, anoopsia, anteroom, aunthood, babyhood, backdoor, backwood, balloons, ballroom, ballyhoo, bankbook, barefoot, barrooms, barstool, bassoons, basswood, bathroom, baywoods, bazookas, bearwood, bebloods, bedrooms, beefwood, beetroot, befooled, beglooms, behooved, behooves, bentwood, besmooth, besoothe, bigaroon, bigfoots, billhook, bloodfin, bloodied, bloodier, bloodies, bloodily, blooding, bloodred, bloomers, bloomery, bloomier, blooming, bloopers, blooping, bluebook, bluewood, boathook, bogwoods, boodlers, boodling, boogying, boogyman, boogymen, boohooed, bookcase, bookends, bookfuls, bookings, booklets, booklice, booklore, bookmark, bookrack, bookrest, bookshop, bookworm, boomiest, boomkins, boomlets, boomtown, boondock, boosters, boosting, bootjack, bootlace, bootlegs, bootless, bootlick, booziest, boxwoods, boyhoods, bradoons, bridoons, brooches, brooders, broodier, broodily, brooding, brooking, brookite, brooklet, broomier, brooming, buckaroo, buckeroo, buffoons, bugaboos, burnoose, caboodle, cabooses, callaloo, canoodle, cardoons, caretook, carpools, Cartoons, casebook, cashbook, cesspool, chapbook, cheroots, chinooks, choosers, choosier, choosing, clubfoot, clubroom, clubroot, coatroom, cockapoo, cockatoo, cocooned, codebook, cooeeing, cooeying, cooingly, cookable, cookbook, cookings, cookless, cookouts, cookshop, cookware, coolants, coolness, cooncans, coonskin, coonties, coopered, coopting, cooption, copybook, cordwood, corkwood, crampoon, crookery, crooking, crooners, crooning, crowfoot, cuckooed, dagwoods, darkroom, daybooks, dayrooms, deadwood, dewooled, dhoolies, dhooties, disproof, disroots, dogtooth, dogwoods, doodlers, doodling, doomsday, doomster, doorbell, doorjamb, doorknob, doorless, doormats, doornail, doorpost, doorsill, doorstep, doorstop, doorways, dooryard, doubloon, dragoons, drooling, droopier, droopily, drooping, dyewoods, ectozoon, eftsoons, enrooted, entozoon, enzootic, epizooty, eyehooks, eyetooth, festoons, finfoots, fireroom, firewood, fishhook, flatfoot, flooders, flooding, floodlit, floodway, floorage, floorers, flooring, floosies, floozies, folkmoot, foodless, foofaraw, foolfish, foolscap, footages, football, footbath, footboys, footfall, footgear, foothill, foothold, footiest, footings, footlers, footless, footlike, footling, footmark, footnote, footpace, footpads, footpath, footrace, footrest, footrope, footsies, footslog, footsore, footstep, footwall, footways, footwear, footwork, footworn, foozlers, foozling, foreboom, foredoom, forefoot, forehoof, forenoon, forsooth, freeboot, fuelwood, gadroons, gadzooks, galloons, galloots, gardyloo, girlhood, gloomful, gloomier, gloomily, glooming, godhoods, godroons, gombroon, goodbyes, goodlier, goodness, goodwife, goodwill, goofball, goofiest, googlies, goombahs, goombays, goopiest, goosiest, gossoons, groomers, grooming, groovers, groovier, grooving, gumboots, gumwoods, gunrooms, hallooed, handbook, handloom, hardboot, hardwood, harpoons, headroom, heirloom, hencoops, hollooed, homeroom, hoodless, hoodlike, hoodlums, hoodooed, hoodwink, hoofbeat, hoofless, hooflike, hookiest, hookless, hooklets, hooklike, hooknose, hookworm, hooligan, hoopless, hooplike, hoopster, hoorahed, hoorayed, hoosegow, hoosgows, hootches, hootiest, hornbook, hotblood, hotfoots, hymnbook, inkwoods, ironwood, jackaroo, jackboot, jackeroo, jargoons, jibbooms, kangaroo, kinghood, kingwood, kookiest, lacewood, ladyhood, lagoonal, lampoons, lardoons, latewood, lawbooks, legrooms, linalool, logbooks, logwoods, lookdown, lookouts, looniest, loophole, loopiest, loosened, loosener, macaroon, madzoons, maidhood, manhoods, markhoor, marooned, matzoons, metazoon, midnoons, milkwood, miscooks, mongoose, monkhood, monsoons, moochers, mooching, moodiest, moonbeam, moonbows, mooncalf, mooneyes, moonfish, mooniest, moonless, moonlets, moonlike, moonport, moonrise, moonsail, moonseed, moonsets, moonshot, moonwalk, moonward, moonwort, moorages, moorcock, moorfowl, moorhens, mooriest, moorings, moorland, moorwort, mudrooms, mungoose, mushroom, nainsook, newsroom, nextdoor, nonbooks, nonwoody, noodging, noodling, nooklike, noondays, noonings, noontide, noontime, notebook, nutwoods, octoroon, offshoot, oilproof, onlooker, oogamete, oogamies, oogamous, oogenies, oogonial, oogonium, oolachan, oologies, oologist, oomiacks, oompahed, oophytes, oophytic, oosperms, oosphere, oospores, oosporic, oothecae, oothecal, ooziness, outbloom, outcooks, outdoors, outfools, outfoots, outlooks, outroots, outscoop, outshoot, outstood, overbook, overcook, overcool, overlook, oversoon, overtook, oxbloods, palookas, pandoors, papooses, pappoose, passbook, patroons, peekaboo, picaroon, pinewood, pinkroot, platoons, playbook, playroom, plywoods, pokeroot, poltroon, pontoons, pooching, poolhall, poolroom, poolside, poorness, poortith, porkwood, pothooks, precooks, precools, proofers, proofing, puccoons, pulpwood, quadroon, raccoons, ratooned, ratooner, rattoons, reaphook, reblooms, rebooked, rechoose, recooked, redroots, redwoods, refloods, regrooms, regroove, reproofs, reroofed, reschool, reshoots, resmooth, restroom, retooled, rigadoon, rockoons, roofings, roofless, rooflike, roofline, rooftops, rooftree, rookiest, roomette, roomfuls, roomiest, roommate, roorbach, roorback, roosters, roosting, rootages, roothold, rootiest, rootless, rootlets, rootlike, roseroot, rosewood, rubaboos, rubbaboo, saleroom, sapwoods, sasswood, sawtooth, schmoose, schmooze, schnooks, schooled, schooner, scoopers, scoopful, scooping, scooters, scooting, scrooges, scrooped, scrootch, seaboots, seafloor, seafoods, selfhood, serfhood, sesspool, shadoofs, shalloon, shampoos, sheroots, shmoozed, shmoozes, shooling, shooters, shooting, shootout, showroom, sickroom, skiddoos, skidooed, skyhooks, slyboots, smooched, smooches, smoothed, smoothen, smoother, smoothie, smoothly, snooding, snookers, snooking, snooling, snoopers, snoopier, snoopily, snooping, snootier, snootily, snooting, snoozers, snoozier, snoozing, snoozled, snoozles, softwood, songbook, sonhoods, soochong, soothers, soothest, soothing, soothsay, sootiest, sourwood, spittoon, spontoon, spoofers, spoofery, spoofing, spookery, spookier, spookily, spooking, spookish, spooling, spooneys, spoonful, spoonier, spoonies, spoonily, spooning, spooring, squooshy, stooging, stookers, stooking, stoolies, stooling, stoopers, stooping, studbook, subcools, subfloor, sunproof, sunroofs, sunrooms, swooners, swooning, swoopers, swooping, swooshed, swooshes, tabooing, tabooley, talookas, tandoori, taprooms, taproots, tarboosh, tattooed, tattooer, teakwood, tearooms, teaspoon, testoons, textbook, tolbooth, tomfools, toolhead, toolings, toolless, toolroom, toolshed, toothier, toothily, toothing, tootlers, tootling, tootsies, trapdoor, troopers, troopial, trooping, typhoons, unbloody, uncooked, uncooled, unhooded, unhooked, unloosed, unloosen, unlooses, unmoored, unroofed, unrooted, unwooded, uprootal, uprooted, uprooter, upshoots, vamoosed, vamooses, vanpools, varoomed, voodooed, vrooming, wallaroo, wanderoo, wardroom, wareroom, washroom, waterloo, wetproof, whoofing, whoopees, whoopers, whooping, whooplas, whooshed, whooshes, wifehood, wildwood, witloofs, woodbind, woodbine, woodbins, woodchat, woodcock, woodcuts, woodener, woodenly, woodhens, woodiest, woodland, woodlark, woodless, woodlore, woodlots, woodnote, woodpile, woodruff, woodshed, woodsias, woodsier, woodsman, woodsmen, woodwind, woodwork, woodworm, wooingly, woolfell, woolhats, wooliest, woollens, woollier, woollies, woollike, woolpack, woolsack, woolshed, woolskin, woolwork, woomeras, woopsing, wooralis, wooraris, wooshing, wooziest, wordbook, workbook, workroom, wormroot, wormwood, yahooism, yearbook, zoochore, zoogenic, zoogleae, zoogleal, zoogleas, zoogloea, zoolater, zoolatry, zoologic, zoomania, zoometry, zoomorph, zoonoses, zoonosis, zoonotic, zoophile, zoophily, zoophobe, zoophyte, zoosperm, zoospore, zootomic

9-letter words

adulthood, afternoon, agalwoods, airproofs, aloofness, alumroots, anoopsias, anterooms, arrowroot, arrowwood, aunthoods, babyhoods, backwoods, ballooned, ballrooms, ballyhoos, bamboozle, bandicoot, bankbooks, barracoon, barstools, basswoods, bathrooms, bearwoods, beblooded, bedroomed, beefwoods, beetroots, befooling, begloomed, behooving, bentwoods, besmooths, besoothed, besoothes, bigaroons, billhooks, birthroot, blackwood, bloodbath, bloodfins, bloodiest, bloodings, bloodless, bloodline, bloodroot, bloodshed, bloodshot, bloodworm, bloodying, bloomiest, bluebooks, bluewoods, boardroom, boathooks, bombproof, booboisie, boogerman, boogermen, boogeying, boogeyman, boogeymen, boohooing, bookcases, bookishly, booklores, booklouse, bookmaker, bookmarks, bookplate, bookracks, bookrests, bookshelf, bookshops, bookstall, bookstore, bookworms, boomboxes, boomerang, boomtowns, boondocks, boorishly, bootblack, booteries, bootjacks, bootlaces, bootlicks, bootstrap, broadloom, broodiest, broodmare, brookites, brooklets, broomball, broomcorn, broomiest, broomrape, brushwood, buckaroos, buckeroos, bucktooth, burnoosed, burnooses, caboodles, calaboose, callaloos, canoodled, canoodles, carpooled, carpooler, cartooned, casebooks, cashbooks, cedarwood, cesspools, chapbooks, checkbook, checkroom, childhood, choosiest, classroom, cloakroom, clubrooms, clubroots, coatrooms, cockapoos, cockatoos, cocksfoot, cocooning, codebooks, coldblood, colicroot, coltsfoot, cookbooks, cookeries, cookhouse, cookshack, cookshops, cookstove, cookwares, cooldowns, coonhound, coonskins, cooperage, cooperate, cooperies, coopering, cooptions, copybooks, cordwoods, corkwoods, courtroom, crampoons, crapshoot, crookback, crookeder, crookedly, crookneck, crowfoots, cuckooing, darkrooms, deadwoods, devilwood, dewooling, disproofs, disrooted, doodlebug, doohickey, doomfully, doomsayer, doomsdays, doomsters, doorbells, doorjambs, doorknobs, doornails, doorplate, doorposts, doorsills, doorsteps, doorstops, dooryards, doubloons, dragooned, driftwood, droopiest, earlywood, elbowroom, enrooting, enzootics, epizootic, faldstool, falsehood, festooned, fireproof, firerooms, firewoods, fishhooks, flatfoots, floodgate, floodways, floorages, floorings, folkmoots, foodstuff, foofaraws, fooleries, foolhardy, foolisher, foolishly, foolproof, foolscaps, footballs, footbaths, footboard, footcloth, footfalls, footfault, footgears, foothills, footholds, footloose, footmarks, footnoted, footnotes, footpaces, footpaths, footprint, footraces, footrests, footropes, footslogs, footsteps, footstone, footstool, footwalls, footworks, forebooms, foredooms, forehoofs, forenoons, foulbrood, freeboots, fruitwood, fuelwoods, gadrooned, germproof, girlhoods, gloomiest, gloomings, gombroons, goodliest, goodwills, goodwives, gooeyness, goofballs, goofiness, goosander, goosefish, goosefoot, gooseneck, grassroot, greenroom, greenwood, grillroom, groomsman, groomsmen, grooviest, guardroom, guidebook, hallooing, handbooks, handlooms, hardboots, hardihood, hardwoods, harpooned, harpooner, headrooms, heartwood, heatproof, heirlooms, hollooing, homerooms, honeymoon, hoodooing, hoodooism, hoodwinks, hoofbeats, hoofprint, hooknoses, hookworms, hooligans, hoopskirt, hoopsters, hoorahing, hooraying, hoosegows, hornbooks, hotbloods, hotfooted, houseroom, hymnbooks, inglenook, ironwoods, isooctane, jackaroos, jackboots, jackeroos, kangaroos, kinghoods, kingwoods, kookiness, lacewoods, ladyhoods, lampooned, lampooner, lancewood, latewoods, leakproof, lifeblood, lightwood, linalools, lookdowns, looniness, loopholed, loopholes, looseners, looseness, loosening, lunchroom, lustihood, macaroons, maidhoods, markhoors, marooning, matchbook, matchwood, milkwoods, miscooked, mongooses, monkhoods, monkshood, monsoonal, moodiness, moonbeams, moondusts, moonfaced, moonishly, moonlight, moonports, moonquake, moonrises, moonsails, moonscape, moonseeds, moonshine, moonshots, moonstone, moonwalks, moonworts, moorcocks, moorfowls, moorlands, moorworts, mothproof, multiroom, mungooses, mushrooms, nainsooks, newsrooms, nonschool, noontides, noontimes, noosphere, notebooks, octoroons, offshoots, onlookers, onlooking, oogametes, oogeneses, oogenesis, oogenetic, oogoniums, oolachans, oologists, oompahing, oospheres, orrisroot, outblooms, outcooked, outdoorsy, outfooled, outfooted, outrooted, outscoops, outshoots, ovenproof, overbooks, overcooks, overcools, overlooks, overproof, overshoot, pantaloon, pappooses, paratroop, passbooks, peekaboos, picaroons, pickaroon, pickproof, pinewoods, pinkroots, platooned, playbooks, playrooms, pokeroots, poltroons, poolhalls, poolrooms, poolsides, poorhouse, poortiths, porkwoods, prebooked, precooked, precooled, preschool, pressroom, proofread, proofroom, protozoon, psalmbook, pulpwoods, puppyhood, pureblood, pussyfoot, puttyroot, quadroons, rainproof, ratooners, ratooning, rattooned, reaphooks, rebloomed, rebooking, rebooting, rechooses, recooking, reflooded, regroomed, regrooved, regrooves, relooking, reroofing, reschools, resmooths, restrooms, retooling, rigadoons, rooflines, rooftrees, rookeries, roomettes, roominess, roommates, roorbachs, roorbacks, rootholds, rootstock, roseroots, rosewoods, roundwood, rubbaboos, rustproof, sainthood, salerooms, salesroom, saskatoon, sasswoods, satinwood, schmoosed, schmooses, schmoozed, schmoozes, schoolbag, schoolboy, schooling, schoolkid, schoolman, schoolmen, schooners, scoopfuls, scoopsful, scrapbook, scrooched, scrooches, scrooping, seafloors, selfhoods, serfhoods, sesspools, shalloons, shampooed, shampooer, shmoozing, shooflies, shootings, shootouts, showrooms, sickrooms, skiddooed, skidooing, skidproof, smooching, smoothens, smoothers, smoothest, smoothies, smoothing, snakeroot, snookered, snoopiest, snootiest, snooziest, snoozling, softwoods, songbooks, soochongs, soothfast, soothsaid, soothsays, sootiness, soupspoon, sourwoods, spittoons, splayfoot, spontoons, spookiest, spoolings, spoonbill, spoonfuls, spooniest, spoonsful, sporozoon, squawroot, squooshed, squooshes, statehood, stateroom, stillroom, stinkwood, stockroom, stoopball, storeroom, storybook, studbooks, stylebook, subcooled, subfloors, supercool, supergood, swooshing, tabooleys, tattooers, tattooing, tattooist, teakwoods, teaspoons, textbooks, toadstool, tolbooths, tollbooth, toolboxes, toolheads, toolhouse, toolmaker, toolrooms, toolsheds, toothache, toothiest, toothless, toothlike, toothpick, toothsome, toothwort, torchwood, touchwood, trapdoors, troopials, troopship, tulipwood, ultracool, unblooded, unbookish, undercool, underfoot, undertook, underwood, underwool, unhooding, unhooking, unloosens, unloosing, unmooring, unroofing, unrooting, uprootals, uprooters, uprooting, vamoosing, varooming, vindaloos, voodooing, voodooism, voodooist, wallaroos, wanderoos, wardrooms, warerooms, washrooms, waterloos, waterzooi, whirlpool, whitewood, whooshing, whoosises, widowhood, wifehoods, wildwoods, windproof, withstood, womanhood, woodbinds, woodbines, woodblock, woodboxes, woodchats, woodchuck, woodcocks, woodcraft, woodenest, woodiness, woodlands, woodlarks, woodlores, woodnotes, woodpiles, woodruffs, woodsheds, woodsiest, woodstove, woodwaxes, woodwinds, woodworks, woodworms, woolfells, woolliest, woolpacks, woolsacks, woolsheds, woolskins, woolworks, wooziness, wordbooks, workbooks, workrooms, wormroots, wormwoods, yahooisms, yearbooks, zebrawood, zoochores, zoogloeae, zoogloeas, zookeeper, zoolaters, zoologies, zoologist, zoomanias, zoomorphs, zoophiles, zoophilic, zoophobes, zoophytes, zoosperms, zoospores, zoosporic, zoosterol, zootomies

10-letter words

adulthoods, afternoons, airproofed, arrowroots, arrowwoods, backwoodsy, ballooning, balloonist, ballyhooed, bamboozled, bamboozles, bandicoots, barefooted, barracoons, bassoonist, beblooding, beglooming, besmoothed, besoothing, birthroots, bitterroot, blackamoor, blackwoods, bloodbaths, bloodguilt, bloodhound, bloodiness, bloodlines, bloodroots, bloodsheds, bloodstain, bloodstock, bloodstone, bloodworms, bloomeries, boardrooms, booboisies, bookbinder, bookkeeper, bookmakers, bookmaking, bookmarker, bookmobile, bookplates, bookseller, bookstalls, bookstores, boomerangs, boondoggle, boosterism, bootblacks, bootlegged, bootlegger, bootlessly, bootlicked, bootlicker, bootstraps, brazilwood, bridegroom, broadlooms, broodiness, broodingly, broodmares, broomballs, broomcorns, broomrapes, broomstick, brushwoods, buffoonery, buffoonish, buttonhook, buttonwood, calabooses, candlewood, canoodling, carpoolers, carpooling, cartooning, cartoonish, cartoonist, cedarwoods, checkbooks, checkrooms, childhoods, childproof, classrooms, cloakrooms, closestool, clubfooted, cocksfoots, cocoonings, colicroots, coltsfoots, cookhouses, cookshacks, cookstoves, coolheaded, coolnesses, coonhounds, cooperages, cooperated, cooperates, cooperator, coordinate, cottonwood, courtrooms, cousinhood, crapshoots, crookbacks, crookedest, crookeries, crooknecks, crushproof, cuckoopint, devilwoods, didgeridoo, didjeridoo, disrooting, donnybrook, doodlebugs, doohickeys, doohickies, doomsayers, doomsaying, doomsdayer, doorkeeper, doorplates, dragooning, driftwoods, droopingly, earlywoods, elbowrooms, epizootics, epizooties, faldstools, falsehoods, fatherhood, festoonery, festooning, fireproofs, flameproof, flapdoodle, flatfooted, floodgates, floodlight, floodplain, floodwater, floorboard, floorcloth, foodstuffs, foolfishes, foolishest, footballer, footboards, footbridge, footcloths, footfaults, footlessly, footlights, footlocker, footnoting, footprints, footstones, footstools, foredoomed, forehooves, foulbroods, freebooted, freebooter, fruitwoods, gadrooning, gadzookery, gingerroot, gloominess, goodnesses, goodwilled, googolplex, goosanders, gooseberry, gooseflesh, goosefoots, goosegrass, goosenecks, grandstood, grassroots, greasewood, greenrooms, greenwoods, grillrooms, groundwood, guardrooms, guidebooks, hardihoods, harpooners, harpooning, heartwoods, homeschool, homoousian, honeymoons, hoodedness, hoodlumish, hoodlumism, hoodooisms, hoodwinked, hoodwinker, hoofprints, hoopskirts, hootenanny, hotfooting, houserooms, hullabaloo, inglenooks, intertroop, isooctanes, jackbooted, knighthood, kookaburra, lampooners, lampoonery, lampooning, lancewoods, lifebloods, lightproof, lightwoods, likelihood, livelihood, loopholing, lunchrooms, lustihoods, maidenhood, matchbooks, matchwoods, minischool, miscooking, monkshoods, mooncalves, moonfishes, moonflower, moonlights, moonquakes, moonscapes, moonshiner, moonshines, moonstones, moonstruck, motherhood, mothproofs, mushroomed, nationhood, nincompoop, noospheres, oozinesses, orangewood, orphanhood, orrisroots, outbloomed, outcooking, outfooling, outfooting, outrooting, outscooped, overbooked, overcooked, overcooled, overlooked, overshoots, pantaloons, paratroops, parenthood, peashooter, peckerwood, peoplehood, personhood, photoflood, picarooned, pickaroons, platooning, pocketbook, poisonwood, poorhouses, poornesses, prebooking, precooking, precooling, preschools, pressrooms, priesthood, promptbook, proofreads, proofrooms, psalmbooks, puppyhoods, purebloods, pussyfoots, puttyroots, rattooning, reblooming, rechoosing, reflooding, regrooming, regrooving, reschooled, reshooting, resmoothed, rootedness, rootstocks, roundwoods, sainthoods, salesrooms, sandalwood, saskatoons, satinwoods, schmoosing, schmoozing, schoolbags, schoolbook, schoolboys, schoolgirl, schoolings, schoolkids, schoolmarm, schoolmate, schoolroom, schooltime, schoolwork, scrapbooks, scrooching, scrootched, scrootches, shampooers, shampooing, shellproof, shockproof, sisterhood, sketchbook, skiddooing, smoothbore, smoothened, smoothness, snakeroots, snookering, snootiness, soothingly, soothsayer, soundproof, soupspoons, sourcebook, spooferies, spookeries, spookiness, spoonbills, spoonerism, springwood, squawroots, squooshier, squooshing, stainproof, statehoods, staterooms, stillrooms, stinkwoods, stockrooms, stoopballs, storerooms, storybooks, stylebooks, subcooling, summerwood, supercools, surefooted, switcheroo, swooningly, swoopstake, tablespoon, tarbooshes, tattooists, tenderfoot, tenterhook, toadstools, tollbooths, tomfoolery, toolholder, toolhouses, toolmakers, toolmaking, toothaches, toothbrush, toothpaste, toothpicks, toothworts, torchwoods, touchwoods, troopships, tulipwoods, undercools, underproof, undershoot, understood, underwoods, underwools, unloosened, unschooled, unsmoothed, upshooting, vanpooling, victimhood, voodooisms, voodooists, waterflood, waterproof, waterzoois, whirlpools, whitewoods, widowhoods, womanhoods, woodblocks, woodchucks, woodcrafts, woodcutter, woodenhead, woodenness, woodenware, woodlander, woodpecker, woodstoves, woodworker, woolliness, yellowwood, zebrawoods, zookeepers, zoolatries, zoological, zoologists, zoometries, zoomorphic, zoophilies, zoophilous, zoosterols

11-letter words

airproofing, aloofnesses, azoospermia, balloonings, balloonists, ballyhooing, bamboozling, bassoonists, besmoothing, bitterroots, blackamoors, bloodguilts, bloodguilty, bloodhounds, bloodlessly, bloodmobile, bloodstains, bloodstocks, bloodstones, bloodstream, bloodsucker, bookbinders, bookbindery, bookbinding, bookishness, bookkeepers, bookkeeping, bookmakings, bookmarkers, bookmobiles, booksellers, bookselling, bookshelves, boomeranged, boondoggled, boondoggler, boondoggles, boorishness, boosterisms, bootleggers, bootlegging, bootlickers, bootlicking, brazilwoods, bridegrooms, broomballer, broomsticks, brotherhood, bucktoothed, bulletproof, bumbershoot, buttonhooks, buttonwoods, candlewoods, cartoonings, cartoonists, cartoonlike, chaulmoogra, closestools, cooperating, cooperation, cooperative, cooperators, coordinated, coordinates, coordinator, cottonwoods, cousinhoods, crapshooter, crookbacked, crookedness, cuckoopints, cycloolefin, didgeridoos, didjeridoos, donnybrooks, doomsayings, doomsdayers, doorkeepers, fatherhoods, fireproofed, flameproofs, flapdoodles, flatfooting, floodlights, floodplains, floodwaters, floorboards, floorcloths, floorwalker, foolhardily, foolishness, footballers, footbridges, footdragger, footfaulted, footlambert, footlockers, footslogged, footslogger, foredooming, freebooters, freebooting, gadroonings, gingerroots, gooeynesses, goofinesses, goosefishes, goosenecked, greaseproof, greasewoods, groundwoods, homeschools, homoousians, honeymooned, honeymooner, hoodlumisms, hoodwinkers, hoodwinking, hooliganism, hullabaloos, intercooler, interschool, knighthoods, kookaburras, kookinesses, leatherwood, likelihoods, livelihoods, looninesses, loosenesses, loosestrife, maidenhoods, microgroove, minischools, moodinesses, moonflowers, moonlighted, moonlighter, moonshiners, motherhoods, mothproofed, mothproofer, mushrooming, nationhoods, neoorthodox, nincompoops, orangewoods, orphanhoods, outblooming, outdoorsman, outdoorsmen, outscooping, outshooting, overbooking, overcooking, overcooling, overlooking, paratrooper, parenthoods, peashooters, peckerwoods, peoplehoods, personhoods, photofloods, picarooning, pilferproof, pocketbooks, poisonwoods, poltroonery, preschooler, priesthoods, promptbooks, proofreader, prophethood, pussyfooted, pussyfooter, reschooling, resmoothing, roominesses, sandalwoods, scattergood, schoolbooks, schoolchild, schoolgirls, schoolhouse, schoolmarms, schoolmates, schoolrooms, schooltimes, schoolworks, scrootching, servanthood, shittimwood, sisterhoods, sketchbooks, smoothbores, smoothening, snapshooter, soothsayers, soothsaying, sootinesses, soundproofs, sourcebooks, splayfooted, spoonerisms, springwoods, squooshiest, summerwoods, supercooled, superschool, supersmooth, switcheroos, tablespoons, tamperproof, teaspoonful, tenderfoots, tenterhooks, textbookish, toddlerhood, toolholders, toolmakings, toothpastes, toothsomely, trapshooter, ultrasmooth, undercooled, undershoots, unloosening, vanpoolings, victimhoods, voodooistic, watercooler, waterfloods, waterproofs, widowerhood, withindoors, woodchopper, woodcutters, woodcutting, woodenheads, woodenwares, woodinesses, woodlanders, woodpeckers, woodshedded, woodworkers, woodworking, woozinesses, yellowwoods, zooplankter, zooplankton, zootechnics

12-letter words

azoospermias, bachelorhood, backwoodsman, backwoodsmen, bloodinesses, bloodletting, bloodmobiles, bloodstained, bloodstreams, bloodsuckers, bloodsucking, bloodthirsty, bookbindings, bookkeepings, booksellings, boomeranging, boondogglers, boondoggling, bootlessness, bootstrapped, broodinesses, broomballers, brotherhoods, buffooneries, bumbershoots, burglarproof, buttonhooked, cartoonishly, chaulmoogras, cooperations, cooperatives, coordinately, coordinating, coordination, coordinative, coordinators, crapshooters, creaturehood, cuckooflower, cycloolefins, dessertspoon, everblooming, festooneries, fireproofing, flameproofed, flameproofer, floodlighted, floorwalkers, foodlessness, footdraggers, footfaulting, footlamberts, footlessness, footsloggers, footslogging, footsoreness, gadzookeries, gloominesses, gobbledegook, gobbledygook, googolplexes, Gooseberries, goosefleshes, goosegrasses, homeschooled, homeschooler, honeymooners, honeymooning, hoodednesses, hooliganisms, hootenannies, intercoolers, interschools, lampooneries, leatherwoods, loosestrifes, microgrooves, moonlighters, moonlighting, mothproofers, mothproofing, neighborhood, neoorthodoxy, nonclassroom, oophorectomy, overshooting, paleozoology, paratroopers, photooxidize, preschoolers, proofreaders, proofreading, prophethoods, protozoology, pussyfooters, pussyfooting, rootednesses, rootlessness, scattergoods, schoolboyish, schoolfellow, schoolhouses, schoolmaster, schussboomer, servanthoods, sharpshooter, shatterproof, shittimwoods, smoothnesses, snaggletooth, snapshooters, snootinesses, soothingness, soothsayings, soundproofed, southernwood, spermatozoon, spinsterhood, spookinesses, supercooling, superschools, surefootedly, teaspoonfuls, teaspoonsful, timberdoodle, toddlerhoods, tomfooleries, toothbrushes, trapshooters, trapshooting, troubleshoot, undercooling, unlikelihood, uprootedness, watercoolers, waterflooded, waterproofed, waterproofer, weatherproof, whippoorwill, widowerhoods, withoutdoors, woodchoppers, woodcuttings, woodenheaded, woodennesses, woodshedding, woodworkings, woolgatherer, woollinesses, zoogeography, zoologically, zooplankters, zooplanktons, zoosporangia, zootechnical, zooxanthella

13-letter words

bachelorhoods, bamboozlement, bloodcurdling, bloodlessness, bloodlettings, bookbinderies, bookishnesses, boorishnesses, bootstrapping, buttonhooking, contrabassoon, cooperatively, coordinations, creaturehoods, crookednesses, cryptozoology, cuckooflowers, cycloolefinic, dessertspoons, epizootiology, flameproofers, flameproofing, floodlighting, foolhardiness, foolishnesses, gobbledegooks, gobbledygooks, homeschoolers, homeschooling, microorganism, misunderstood, neighborhoods, nincompoopery, nonclassrooms, noncooperator, photooxidized, photooxidizes, poltrooneries, schoolfellows, schoolmarmish, schoolmasters, schoolteacher, schussboomers, sharpshooters, sharpshooting, soundproofing, southernwoods, spinsterhoods, tablespoonful, timberdoodles, toothbrushing, toothsomeness, trapshootings, troubleshoots, uncooperative, uncoordinated, undershooting, unlikelihoods, waterflooding, waterproofers, waterproofing, weatherproofs, whippoorwills, woolgatherers, woolgathering, zoogeographer, zoogeographic, zooplanktonic, zoosporangium, zooxanthellae

14-letter words

bamboozlements, bloodthirstily, bootlessnesses, contrabassoons, cooperationist, coordinateness, electroosmoses, electroosmosis, electroosmotic, epizootiologic, foodlessnesses, footlessnesses, footsorenesses, incoordination, microorganisms, neoorthodoxies, noncooperation, noncooperative, noncooperators, oophorectomies, paleozoologies, paleozoologist, photooxidation, photooxidative, photooxidizing, protozoologies, protozoologist, rootlessnesses, schoolchildren, schoolmasterly, schoolmistress, schoolteachers, sharpshootings, snaggletoothed, soothingnesses, surefootedness, tablespoonfuls, tablespoonsful, toothbrushings, troubleshooter, uprootednesses, waterproofings, waterproofness, weatherproofed, woolgatherings, zoogeographers, zoogeographies

15-letter words

bloodguiltiness, bloodlessnesses, cooperationists, cooperativeness, cryptozoologies, cryptozoologist, dessertspoonful, epizootiologies, foolhardinesses, grandparenthood, incoordinations, nincompooperies, noncooperations, outdoorsmanship, paleozoological, paleozoologists, photooxidations, protozoologists, schoolmasterish, toothsomenesses, troubleshooters, troubleshooting, weatherproofing, zoogeographical

16-letter words

bloodthirstiness, coordinatenesses, cryptozoologists, dessertspoonfuls, dessertspoonsful, electrooculogram, electroosmosises, epizootiological, grandparenthoods, outdoorsmanships, schoolmistresses, surefootednesses, waterproofnesses, weatherproofness

17-letter words

bloodguiltinesses, cooperativenesses, electrooculograms, noncooperationist, zoogeographically

18-letter words

bloodthirstinesses, electrooculography, noncooperationists, weatherproofnesses

20-letter words

electrooculographies
Some words with double O:* boo!* balloon* bamboo* boot* broom* book* cook* cookie* cool* choose* cartoon* door* doom* foot* flood* good* groove* goose* gloom* hood* hook* hoop* igloo* loot* loon* loom* loose* moon* moose* maroon* noon* noose* noodle* nook* ooze* pool* proof* rooster* room* root* rookie* roof* raccoon* soon* stoop* school* scoop* shook* stool* snoop* smooth* scoot* spoon* swoon* taboo* tycoon* typhoon* tool* took* too* wool* zoo* zoom
ootheca, oophorectomy, o-o, oof, OOD, oogamous, ooh, oolite, ooze, oocyst, oomiak

Answer 7

senescence, recherche, tattletale: all thanks to the New York Times Crossword Puzzle by David Steinberg!

Answer 8

Here are a few examples of four-letter words having "oo":

book

food

hoot

loop

oops

poor

soon

wood

Answer 9

• Oath
• Oust
• Omen
• Open
• Oleo
• Ooze
• Oval
• Opal
• Owed

Answer 10

Zero