---

• overflow
• obscure
• oe
• otter
• ort
• of
• outcast
• obsessed
• oneself
• obsequious
• ouster
• outrageous
• overweening
• oppression
• offence
• onslaught
• onset
• outset
• observable
• overcoat
• obscurity
• overlay
• offend
• outgrowth
• obbligato
• organism
• onerous
• oppress
• onus
• overrun
• owned
• oppressive
• ordinal
• occur
• oriel
• ornamentation
• obsession
• onlooker
• oldster
• observer
• officiate
• offspring
• overseer
• originator
• oversee
• obstruction
• observance
• omnipotent
• obstacle
• offering
• oblation
• offertory
• offensive
• outbreak
• optimism
• oblige
• oil
• outburst
• osculate
• ointment
• outlet
• offender
• obligation
• obedience
• outskirts
• outpost
• opponent
• objection
• ovation
• obscenity
• ornament
• obsequies
• odorous
• operetta
• opera
• obliterate
• overcast
• overshadow
• observant
• outing
• operator
• overseas
• oblivious
• other
• ostensible
• operatic
• objectionable
• obstruct
• otherwise
• odious
• off
• okay
• opportune
• or
• obscene
• outgoing
• obtainable
• oppressor
• overt
• outsider
• outlander
• outlandish
• open-minded
• open-handed
• occupant
• outward
• observe
• oneness
• ogre
• ore
• ooze
• occupational
• over
• obfuscate
• odd
• orbit
• obedient
• ocean
• outright
• opposition

---

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