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• overbearing
• onwards
• own
• ocean
• outpatient
• orient
• open-minded
• oasis
• oblong
• one
• overpass
• ombudsman
• oftentimes
• offence
• ordinary
• overflow
• ogle
• organized
• oriental
• optimistic
• obstruct
• outpouring
• occupation
• ostentation
• overlook
• oar
• offshoot
• outspoken
• oration
• ordinal
• occultation
• owl
• oceania
• orderly
• overgrown
• occidental
• output
• openness
• owner
• obscene
• onset
• oven
• oaf
• oily
• original
• obligation
• objective
• opening
• oyster
• occasional
• overtake
• optic
• overcome
• optical
• off-chance
• opiate
• outreach
• otter
• ozone
• omnipotent
• oddity
• oracle
• oppressor
• overall
• orchestra
• orange
• oxygen
• orotund
• orator
• off
• object
• overload
• originate
• one-off
• obese
• oblige
• outlaw
• offense
• ornithology
• outer
• ownership
• oh
• ornament
• overalls
• ostracize
• omelet
• overwork
• om
• outside
• order
• open
• obedience
• offside
• oceanography
• onus
• outrigger
• outlawry
• ordain
• on
• over
• OS
• o
• oak
• outlandish
• or
• owe
• opinionated
• onslaught
• OPEC
• opportune
• observable
• occupy
• overmuch
• only
• obstruction
• overthrow
• operetta
• Ottawa
• oxide
• openly

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因篇幅关系，字母O开头的单词只列出前 120 个；字母O开头的英语单词由君君词典提供查询