- oligopoly
- opponency
- oxbridge
- osmose
- oof bird
- offhandedness
- once or twice
- ornithoscopy
- optometrist
- other-worldly
- octangular
- opossum
- oxyacetylene
- off stage
- omniscience
- off the reel
- overeat
- one thinks fit
- out consume
- oldness
- off the mark
- over-powered
- octet
- omit. neglect
- official procedure
- on draught
- obedience to
- on enchant
- out check
- objector
- odd-jobber
- on disparage
- on the slant
- out disregard
- outhouse
- on time
- on regulate
- off guard
- optimistically
- out of reach
- or
- oneself lie down
- out show
- of little consequence
- outdoor meal
- one by one
- old-age pension
- off settle
- outdoors
- out pay
- one's stride cope with easily
- one's ground
- on-the-spot
- on exploit
- out exclaim
- of the Middle Ages
- original inhabitant
- open framework
- outrider
- oldage pensioner
- order off
- obey the rules
- out of breath
- on hire purchase
- over-particular
- out of favour
- out of one's hands
- out of devastate
- on one's father's side
- out of the public eye
- ordering back
- off get over
- on all sides
- outsource
- on take pride in
- one more
- on the same level as
- old horse
- office worker
- orgasm
- of greatest import-ance
- over ignore
- on the back praise
- on stockpile
- oral examination
- on one's own
- outfall
- official communica-tion
- on one's deathbed
- one time
- on eself manage
- of around
- open space
- obliged to
- out attire
- out of one's element
- opinion poll
- off-white
- out of someone drain
- one's thumbs be idle