Four letter word with O

Ogre, Once, Only, Oreo, Ouch, Oven, oars, oath, oats, oils, okay, omen, onto, oops, opal, open, ours, oval, over, owls, oink, Ohio, Oman, Oslo, Over., orca, oaks, oboe, outs, ones, orgy, oily, Otto, odds, Owns, Oust, Ores, odor, Okra, Opel, Onyx, ogle, Ooze, Orbs, osos, obey, omit, olga, olaf, Oper, oder, Orcs, Orka, olly, opra, orto, oaky, OMFG, octo, olde, okey, oxen, Omni, owen, Olas, ocre, Ohne, Ofen, Orco, Omar, Ovum, oppa, odes, olla, otro, Ohms, onus, Obst, Odin, Omas, olor, olay, osea, orks, Oups, Opus, Ojos, Owed, Okno, Old, oleo, ovos, onda, Ocak, Owes, Orla, owch, oben, ount, oafs, oden, Ocho, Ober, Oops!, organ, orange, Offs, one, Otis