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87 words that are 4 letters long beginning with o.

oafs oaks oars oath oats obes obey obia obis oboe obol ocas odds odes odic odor odyl offs ogam ogle ogre ohed ohia ohms oils oily oink okas okay okeh okes okra oldy olea oleo olio omen omit once ones only onto onus onyx oohs oops oots ooze oozy opah opal open opes opts opus orad oral orbs orby orca ores orra oryx osar oses ossa ouch ouds ouph ours oust outs ouzo oval oven over ovum owed owes owls owns owse oxen oxes oxim oyer oyes