- forty eight
- forty four
- forty nine
- forty one
- forty six
- fifo
- fly off the handle
- fohn
- fellata
- foehn
- folk dancing
- fado
- folklore
- folk etymology
- folk writer
- federation of tribes
- folk morals
- foliaged
- formicary
- family liopelmidae
- fermata
- framer
- freeware
- fluphenazine
- fortran programming
- forewoman
- fractional currency
- fifty eight
- fiat money
- Farm Credit System
- FCS
- flies
- farm bill
- field officer
- fo
- field_sequential color tv
- fielder's choice
- field_sequential color tv system
- field_sequential color television
- frank breech
- forceps major
- frank breech delivery
- fly bridge
- flying bridge
- fieldmouse
- fixed phagocyte
- founder or leader (of a school of thought)
- fire marshall
- forest fire fighter
- fire warden