- old harry
- old hat
- old lady
- old maid
- old man
- old master
- old measurement
- old money
- old moon
- old nick
- old price
- old river
- old salt
- old sand
- old school
- old share
- old shares
- old sight
- old stock
- old style
- old surplus
- old version
- old working
- old-clothesman
- old-established
- old-fashioned
- old-fashionedness
- old-fogey
- old-fogeyish
- old-fogy
- old-fogyish
- old-lag
- old-maidish
- old-stager
- old-sweat
- old-time
- old-timer
- old-wife
- old-woman
- old-womanish
- old-womanishness
- old-womanliness
- old-womanly
- olden
- older tertiary
- oldham coupling
- oldie
- oldish
- oldishness
- oldland
- oldsquaw
- oldster
- oldwife
- ole
- olea
- oleacae
- oleaginous
- oleaginously
- oleander
- oleandomycin
- oleandrism
- oleaster
- oleate
- olecranal
- olecranarthritis
- olecranarthrocace
- olecranarthropathy
- olecranon
- olecranon process
- olecranon spur
- olefiant
- olefiant gas
- olefin
- olefinic
- olefinic content
- oleic
- oleic acid
- oleiferous
- olein
- olenitis
- oleo
- oleo department
- oleo oil
- oleo stock
- oleo-resin
- oleo-resins
- oleograph
- oleographic
- oleography
- oleomargarine
- oleometer
- oleophilic
- oleophilic belt
- oleoresin
- oleoresinous
- oleoresinous paint
- oleoresinous varnish
- oleosaccharum
- oleotherapy
- oleothorax