Browse the Oxford Advanced American Dictionary
- olive oil
noun - ollie
noun - -ology
combining form - ology
noun - Olympiad
noun - Olympian
adjective - Olympian
noun - Olympic
adjective - Omaha
- Oman
noun - Omani
noun - ombudsman
noun - omega
noun - Omega-3
noun - omelet
noun - omen
noun - omicron
noun - ominous
adjective - omission
noun - omit
verb - omni-
combining form - omnibus
adjective - omnibus
noun - omnidirectional
adjective - omnipotent
adjective - omnipresent
adjective - omniscient
adjective - omnivore
noun - omnivorous
adjective - on
adverb - on
preposition - on-air
adjective - on-board
adjective - on-call
- on-demand
adjective - on-field
adjective - on-off
adjective - on-ramp
noun - on-screen
adjective - on-street
adjective - once
adverb - once
conjunction - once-over
noun - oncology
noun - oncoming
adjective - one another
pronoun - one
number - one
pronoun - one's
determiner - one-armed bandit
noun
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