Four letter word with O

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