100 SAT words Beginning with “O”

oasis

obdurate

obedient

obeisance

obfuscate

objective

obligation

oblique

oblivious

obloquy

obscure

obsequious

obsolete

obstinate

obstreperous

obstruct

obtain

obtrusive

obtuse

obviate

occlude

occult

occupy

odious

odium

odoriferous

odyssey

offend

officious

offset

ogle

olfactory

oligarchy

omen

ominous

omit

omnipotent

omnipresent

omniscient

omnivorous

onerous

onomatopoeia

onslaught

onus

opalescent

opaque

operative

opiate

opponent

opportune

opportunist

opposition

oppressive

opprobrium

optimist

optional

opulent

opus

oracle

oracular

orator

ordinance

ordinary

ordination

organic

orientation

orifice

origin

originate

ornate

ornithologist

orotund

orthodox

orthogonal

oscillate

osseous

ossify

ostensible

ostentatious

ostracize

otiose

oust

outcome

outlandish

outrage

outrageous

outskirts

outspoken

outwit

ovation

overbearing

overcome

oversight

overt

overthrow

overweening

overwhelming

overwrought

overzealous

oxymoron