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• overstep
• ominous
• opener
• own
• overtly
• outstanding
• oftentimes
• organizer
• overture
• overdose
• owe
• outwit
• outsmart
• operational
• original
• obvious
• oath
• occupant
• oriental
• outer
• oblivious
• outlaw
• objection
• occupancy
• outspoken
• offend
• obligatory
• ordinance
• option
• originator
• omnipresence
• organic
• objective
• opposition
• organ
• official
• overlook
• occasionally
• overturn
• occasion
• oar
• ostensible
• obliteration
• outflow
• occult
• overseas
• overweening
• oblivion
• Olympic
• obscurity
• once
• ophthalmic
• of
• overnight
• observer
• obfuscate
• overall
• opposite
• observation
• offer
• order
• orthodox
• ornament
• odometer
• opponent
• organism
• orient
• Ottoman
• offensive
• opportune
• overlay
• opulence
• obsolete
• organize
• one-sided
• occupation
• optimal
• obverse
• outlet
• open-minded
• oppose
• oust
• obligation
• obligate
• offshoot
• occupied
• occupational
• obstinate
• odd
• obscene
• occupy
• oval
• obloquy
• operate
• obscure
• opaque
• on
• only
• ort
• one
• officious
• overtime
• off
• outrun
• overdue
• obstruct
• orange
• octagon
• occurrence
• overmuch
• olfactory
• opprobrious
• olfaction
• old
• oldie
• octopus
• opinion
• outfit
• omniscience
• over

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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