obtain, v. [gain], [get], [procure], acquire, [win], [attain], [secure].
obtainable, a. procurable, [attainable], accessible. Antonyms: [unobtainable], unprocurable, [unattainable], inaccessible.
obtrusive, a. [officious], [meddlesome], [intrusive], [forward]. Antonyms: inobtrusive, [retiring].
obvious, a. [plain], [evident], palpable, [manifest], [patent], [self-evident].
occult, a. [mystic], mystical, [abstruse], [recondite], [secret], unrevealed.
occupant, n. occupier, tenant, [holder], [incumbent], [possessor], lessee.
occupation, n. occupancy, tenure, incumbency; vocation, employment. See business.
occupational, a. vocational.
occupy, v. [hold], [keep], [possess], [fill]; [engage], [absorb], employ, [busy], [monopolize].
ocean, n. [main], [deep]. Associated words: oceanic, interoceanic, doldrums, oceanography, oceanology, terrigenous, Oceanus, transoceanic.