O

o'clock (adverb)
obey (verb)
1object (noun)
2object (verb)
objection (noun)
1objective (adjective)
2objective (noun)
1observation (noun)
observe (verb)
obtain (verb)
obvious (adjective)
1occasion (noun)
occupation (noun)
occupy (verb)
occur (verb)
ocean (noun)
October (noun)
odd (adjective)
odor (noun)
of (preposition)
1off (adverb)
2off (preposition)
offend (verb)
offense (noun)
1offensive (adjective)
1offer (verb)
2offer (noun)
office (noun)
officer (noun)
1official (adjective)
often (adverb)
1oh (interjection)
1oil (noun)
1OK (adverb)
2OK (adjective)

old-fashioned (adjective)
1old (adjective)
1on (preposition)
2on (adverb)
3on (adjective)
1once (adverb)
2once (noun)
1one (noun)
2one (pronoun)
3one (adjective)
oneself (pronoun)
1only (adjective)
2only (adverb)
onto (preposition)
1open (adjective)
2open (verb)
3open (noun)
1opening (noun)
operate (verb)
operation (noun)
opinion (noun)
opponent (noun)
opportunity (noun)
oppose (verb)
1opposite (adjective)
2opposite (adverb)
3opposite (noun)
4opposite (preposition)
opposition (noun)
option (noun)
orange (noun)
1order (noun)
2order (verb)
1ordinary (adjective)
organ (noun)
organization (noun)
organize (verb)
origin (noun)
1original (adjective)
2original (noun)
originally (adverb)
1other (adjective)
2other (pronoun)

1otherwise (adverb)
ought (verb)
ounce (noun)
our (adjective)
ours (pronoun)
ourselves (pronoun)
1out (adverb)
outcome (noun)
1outdoors (adverb)
2outdoors (noun)
outer (adjective)
1outline (noun)
2outline (verb)
1output (noun)
1outside (noun)
2outside (adjective)
3outside (adverb)
4outside (preposition)
outstanding (adjective)
1outward (adjective)
2outward (adverb)
oven (noun)
1over (adverb)
2over (preposition)
1overall (adverb)
2overall (adjective)
overcome (verb)
overwhelm (verb)
owe (verb)
1own (adjective)
3own (verb)
owner (noun)
ownership (noun)