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
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
Examples of five letter words that end in "o" are:AlamoaudiobanjobingobongobravoburrocameocargoCongocuriodingodittofolioforgogeckoguanogumbohelloigloojumbokazoolassolimbolottomangomatzomomboMongomottonachooutdopatiopestophotopianopolioradioratiorhinorodeoRomeotabootangotempotorsovideoYahoo
gusto
Some 5 letter words that end in O are:bingobongocuriocellocondoCongodingodiscodittofoliohellojellolassolingopatiopintopromopolioradioratiorodeoromeostenovireoVirgo
hobo
natio
AlamoAmigoAminoAudio
Bongo
Some four letter words that end with "o" are:zerohaloherohobointojudokiloalsoaltoautoechomemoontopolosilosolotacotarotrioundoveto
tornadotorpedo
Five letter words that start and end with letter O are outdo and outgo.
Ratio
Cameo