GRE Master Word list, 20th 2013
Word List 33 obtuse-palliate 60
obtuse
obviate
occlude
occult
odious
odium
odyssey
offensive
offhand
officious
oligarchy
ominous
omnipotent
omnipresent
omniscient
omnivorous
onerous
onslaught
onus
opaque
opportune
opportunist
opprobrium
optimist
optimum
optional
opulence
opus
oracular
orator
ordain
ordeal
ordinance
orgy
orient
orientation
ornate
orthodox
oscillate
ostensible
ostentatious
ostracize
oust
outlandish
outmoded
outspoken
outstrip
outwit
ovation
overbearing
overt
overweening
overwrought
pacifist
pacify
painstaking
palatable
palatial
pall
palliate