origin
加入词篮original
original
original sin
originality
originally
originate
originate
oriole
orison
ornament
ornamental
ornamentation
orphan
orphan
orphanage
orphanhood
Orthodox
Orthodoxy
orthopedic
orthopedics
Oscar
Oscar
oscillate
oscillation
oscillator
osteoarthritis
osteology
osteopath
osteoporosis
ostrich
other
otherwise
Ottawa
otter
ouch
ought
ounce
our
ours
ourselves
oust
ouster
out
out of
out of date
out-of work
outback
outbreak
outcome
outdate
outdated
outdoor
outdoors
outer
outfit
outflow
outgoing
outing
outlandish
outlay
outlet
outlet
outline
outline
outlook
outlying
outmoded
outpatient
outplacement
outplay
outpoint
outpost
output
output
outrage
outreach
outset
outside
outsider
outsize
outskirt
outskirts
outspoken
outstanding
outstrip
outward
outwards
oval
ovary
ovary
oven
oven glove
oven-ready
over
over and over again
over there
overall
overall
