- oblate
- oblation
- obligate runner
- obligation
- obligato
- obligatory
- obligatory parasitism
- oblige
- obligee
- obliging
- obligor
- oblique
- oblique angle
- oblique sailing
- obliquity
- obliterate
- obliteration
- oblivion
- oblivious
- oblomov
- oblong
- obloquy
- obmutescence
- obnoxious
- oboe
- oboist
- obolus
- obovate
- obovoid
- obscene
- obelisk
- obligate
- obscenity
- obscurant
- obscurantic
- obscuration
- obscure
- obscurity
- obsecrate
- obsecration
- obsequial
- obsequies
- obsequious
- observable
- observance
- observant
- observation
- observation balloon
- observation car
- observation check
臉書專頁