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• ostentatious
• outstanding
• outset
• off-key
• ordinance
• outlaw
• organized
• outreach
• overweight
• oppress
• overcast
• offender
• outgoing
• obliterate
• orifice
• optimism
• overhand
• of
• occasion
• odometer
• offer
• obsession
• old
• oration
• ornamentation
• omission
• only
• odd
• often
• opportune
• outfit
• open
• obstacle
• overthrow
• overmuch
• occupied
• obligation
• opportunity
• obvious
• once
• overnight
• oddity
• outstrip
• obsess
• over
• officiate
• outlying
• onerous
• open-handed
• obtuse
• observe
• overstep
• objectionable
• outpatient
• overrate
• omnipotence
• obit
• outspoken
• officious
• occupation
• obstruction
• organization
• overtly
• off-chance
• overture
• occur
• oblique
• oversee
• outsider
• opera
• outcome
• oppressive
• outflow
• overstate
• okay
• overcome
• obstinate
• opium
• optimistic
• obedience
• oil
• organism
• open-minded
• overturn
• organize
• obese
• ownership
• orderly
• oneness
• outward
• obsolete
• ovation
• or
• outer
• openness
• overhaul
• obscenity
• other
• obtainable
• outskirts
• outcast
• originality
• object
• odium
• outline
• off
• ominous
• oversight
• own
• occultation
• obbligato
• ordure
• oblivious
• overdone
• offence
• offering
• order
• occult
• omnipresence
• onward

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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