Some five letter words with O as the second and third letter are:
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Audio, cameo, photo, burro, ditto
abmho, achoo, adobo, aggro, Alamo, altho, amido, amigo, amino, amnio, ancho, andro, anglo, audio, aviso, azido, baboo, banco, banjo, basso, bazoo, beano, bento, bilbo, bimbo, bingo, boffo, bongo, bravo, bromo, bucko, buffo, bunco, bunko, burro, buteo, cacao, cameo, campo, canso, canto, cargo, cello, cento, chiao, chico, chino, chiro, cholo, Cisco, claro, combo, compo, condo, congo, conto, credo, curio, cusso, cyano, cyclo, danio, datto, dekko, diazo, dildo, dingo, dipso, disco, ditto, dobro, doggo, dumbo, duomo, erugo, fillo, folio, fordo, forgo, fugio, fungo, gecko, genro, gesso, gismo, gizmo, gombo, gonzo, grego, guaco, guano, guiro, gumbo, gusto, hallo, helio, hello, hillo, hippo, hollo, hullo, hydro, igloo, imago, imido, imino, intro, jello, jingo, jocko, jumbo, junco, junto, karoo, kazoo, kendo, kiddo, kusso, laevo, largo, lasso, lento, limbo, lingo, litho, llano, lotto, macho, macro, mambo, mango, matzo, metro, mezzo, micro, mimeo, misdo, molto, mondo, mongo, morro, mosso, motto, mucho, mucro, mungo, nacho, narco, nitro, ortho, outdo, outgo, ovolo, panto, pargo, paseo, patio, pedro, pengo, pesto, petto, phono, photo, piano, pingo, pinko, pinto, pisco, polio, porno, potto, primo, promo, proso, punto, putto, radio, ratio, recto, repro, retro, rhino, rodeo, romeo, rondo, salvo, sambo, sargo, schmo, scudo, secco, segno, servo, sexto, shako, sicko, sixmo, socko, soldo, sorgo, spado, steno, sulfo, taboo, tango, tanto, tardo, telco, tempo, thoro, tondo, torso, trigo, turbo, uredo, verso, video, vireo, vulgo, wacko, wahoo, whamo, whoso, wilco, Yahoo, yobbo
226 words
Books, booed, booms, boors, boost, boobs, booth, booty, boots, zooms, woofs, wools, roomy, tools, sooty, roots, noose, pools, loons, moons, looks, dooms, fools, goods, goofs, doors, foods, goons, hoods, hoofs, hoops, hooks, loofa, moody, loose, nooks, moose, roost.
Action, anchor, author, bamboo, bishop, bottom, cannon, carton, common, cowboy, deacon, dragon, eggnog, falcon, flavor, glamor, harbor, Horror, indoor, kazoos, laptop and macros are 6 letter words. Additional words include mascot, method, nation, ocelot, pardon, patron, proton, random, rhinos, salmon, school, summon, tattoo, tycoon, unison, vendor, weapon, yellow and zealot.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 17 words with the pattern ----O-O. That is, seven letter words with 5th letter O and 7th letter O. In alphabetical order, they are:
amoroso
chanoyo
commodo
diabolo
furioso
giocoso
madrono
mafioso
nitroso
okimono
oloroso
piccolo
quomodo
tombolo
tremolo
zoccolo
zuffolo
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern -O--O---O. That is, nine letter words with 2nd letter O and 5th letter O and 9th letter O. In alphabetical order, they are:
polyomino
portolano
songololo