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oで始まる単語
oak
obedience
obedient
obey
object
objection
objective
obligation
oblige
obscure
obscurity
observation
observe
observer
obsession
obsolete
obstacle
obstruct
obstruction
obtain
obvious
occasion
occasional
occupant
occupation
occupational
occupy
occur
occurrence
ocean
October
odd
off
offend
offender
offense
offensive
offer
office
officer
official
offset
offspring
oil
old
omit
one
ongoing
onion
online
only
onward
open
opera
operate
operation
operational
operative
operator
opinion
opponent
opportunity
oppose
opposite
opposition
oppress
oppression
oppressive
optimistic
option
optional
oral
orange
orbit
orchestra
order
ordinary
organ
organic
organism
organization
organize
orient
origin
original
originate
other
ought
ounce
outbreak
outcome
outdoor
outer
outfit
outlet
outline
outlook
outnumber
output
outrage
outrageous
outset
outside
outsider
outstanding
outweigh
oven
overall
overcome
overdo
overdue
overestimate
overhead
overlap
overlook
overpower
oversee
oversight
overtake
overthrow
overtime
overturn
overweight
overwhelm
overwhelming
owe
own
owner
ownership
oxygen
ozone