- official residence
- order back
- ophidian
- old fogy
- orga-nize
- observe the rules
- open to suggestions
- occupied in
- opulently
- observance of
- of benefit
- on the HP
- once a day
- of long ago
- on horseback
- official killer
- open wide
- outgoing person
- offer one's services
- ostenta-tious
- ossified
- orthodontist
- of no consequence
- one at a time
- on the top
- on the far side of
- on the other hand
- order someone about
- on the distaff side
- other ranks
- obit
- operations
- objects
- out of condition
- o'clock
- out of position
- overview
- over-suspicious
- out-of-doors
- over-ornate
- outpatients' department
- oversimple
- oversimplified
- outburst of anger
- on every occasion
- off the rack
- own particular
- obsessive fear
- on the authority of
- object of ridicule
- out of proportion
- onesidedness
- outermost
- out in the open
- of the greatest significance
- open someone's eyes
- overstress
- old clothes
- other possibility
- out dated
- offcial
- on good terms
- over-scrupulous
- on the alert
- one-rous
- over-trusting
- official separation
- overplay it
- official opening
- over-inflated
- of course not
- over again
- of greatest significance
- on the sly
- overeating
- offer marriage
- overambitious
- onesided
- on schedule
- oxen
- of influence
- Olympic
- oblong
- on the edge
- over-abundance
- one-use
- officiate at
- occur again
- opponent in law
- of considerable importance
- ominousness
- on one's stomach
- of higher quality
- obligated
- over-elaborate
- over-sentimental
- out of the spotlight
- oblational
- of low intelligence
- off track