O字母开头的单词或词组(第15页)：
- outstrip
- outwit
- ovation
- overbearing
- overdose
- overdue
- overexposure
- overlap
- overflow
- overhaul
- overlook
- overpowering
- overriding
- override
- overreach
- oversee
- overrule
- overshadow
- overstate
- overt
- overture
- overthrow
- overturn
- overwrought
- overwhelm
- odoriferous
- oddments
- owl
- oxidize
- olfactory
- ocular
- occidental
- observance
- oblation
- obelisk
- oatmeal
- oar
- obtrude
- oligarch
- omnivorous
- onslaught
- onus
- opiate
- optimization