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• oddness
• overtly
• obnoxious
• originator
• only
• occupant
• oust
• overwhelm
• or
• outskirts
• ogre
• onboard
• overrun
• optimize
• overstep
• outrageous
• overhand
• ocean
• output
• oldster
• override
• opt
• orchid
• outside
• obliged
• oversight
• overrate
• opening
• opulence
• opium
• overcast
• offshoot
• obedience
• off-beat
• occupational
• objection
• omen
• oneself
• obligatory
• opener
• ooze
• onward
• origin
• optional
• overthrow
• obtuse
• opinion
• oblige
• old-fashioned
• obliging
• optimistic
• outline
• outset
• obtrusive
• offer
• orbital
• ovation
• ornamentation
• order
• old
• obtainable
• obesity
• ore
• ostensible
• obverse
• oceanic
• oppression
• ostentatious
• ongoing
• outlaw
• offspring
• occasional
• osculate
• oftentimes
• obstreperous
• organ
• outfit
• outdoors
• overall
• opposite
• official
• overstate
• operator
• ox
• occasion
• obedient
• octopus
• ouster
• omega
• operose
• oblique
• obstacle
• openly
• oblivious
• overmuch
• option
• open-minded
• overdo
• orientate
• observer
• orange
• outdated
• optimism
• ours
• overturn
• outpouring
• obscenity
• oriented
• oriental
• overweening
• orderly
• of
• offence
• ominous
• ophthalmic
• operate
• orient
• owner
• obese
• overcoat

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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