Hundreds of 5 letter words include the letter o as the 4th letter. A few of those words include abbot, abhor, actor, adios, afoot, aglow, allot, allow, alloy, aloof, apron, arbor, armor, arrow, arson, ascot, bacon, baron, baton, bayou, begot, below, bigot, bison, blood, bloom, broom, canoe, chaos, cocoa, colon, color, crook, décor, decoy, defog, demon, depot, detox, divot, drool, elbow, enjoy, envoy, error, estop, extol, favor, felon, flood, floor, furor, gator, gloom, groom, havoc, honor, humor, idiot, igloo, ingot, juror, kazoo, labor, lemon, manor, mason, mayor, melon, minor, moron, motor, nylon, onion, pesos, phlox, pilot, pivot, prior, proof, razor, robot, rotor, rumor, salon, scoop, scoot, shoot, snoop, spoof, spool, spoon, stood, stool, stoop, throb, throw, troop, tumor, tutor, unbox, union, valor, vapor, vigor, visor, wagon, widow, Yahoo and zeros.
Some five letter words with second letter O and fourth letter E are:bogeybowelbowercometcovencoverdowelhotellosermodelmowernoseynovelpowerrover
Five letter words with the second and fourth letter O are:boronbosomcocoacoloncolordonorhonormoronmotorrobotrotor
chaos
5 letter words with 2nd letter O and 4th letter N:boundcountcornydoingfoundgoinghoundjointloonymoundmountpointpoundroundsoundwoundyoung
Some four letter words with second letter U and fourth letter O are:autoeurojudokudoouzo
Some five letter words with second letter O and fourth letter E are:bogeybowelbowercometcovencoverdowelhotellosermodelmowernoseynovelpowerrover
Five letter words with the second and fourth letter O are:boronbosomcocoacoloncolordonorhonormoronmotorrobotrotor
chaos
5 letter words with 2nd letter O and 4th letter N:boundcountcornydoingfoundgoinghoundjointloonymoundmountpointpoundroundsoundwoundyoung
Some four letter words with second letter U and fourth letter O are:autoeurojudokudoouzo
"error"
oblong
obese
vowel
proof
Five letter words that start and end with letter O are outdo and outgo.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -O-OO. That is, five letter words with 2nd letter O and 4th letter O and 5th letter O. In alphabetical order, they are: potoo