- fight like a tiger
- fight someone off, fight something off
- fighting
- fighting-cock
- firmament
- feasible
- first foot
- fearsome
- fco
- fl oz
- flab
- flabbergast
- fart
- flag
- flag-mast
- flaming
- flamy
- flare up
- flash card
- flash cube
- flat bottomed
- farewell
- flat ladle
- flat rate
- flat spin
- flee from
- fleer
- flench
- flesh
- farcify
- far from
- fleshy
- flexion
- flick
- float
- floating
- famishing
- flog
- family feud
- floorer
- flop
- family breadwinner
- familiar
- falter
- falsity
- fluoride
- flurried
- fluted
- fluxionary
- fly go out of the window
- fly into rage
- fly of the handle
- fly-fishing
- foible
- fall foul of
- fall apart
- folder
- foliage
- faithful
- feeling
- foolish fellow
- foot movement
- foot stone
- football pool
- factitious
- factious
- foray
- facsimile
- forbearing
- foyer
- facilitate
- fractious
- fragile
- frail
- frame-up
- frantic
- fratricide
- freely
- face gear
- fresh butter
- foolish fancy
- fresh-water snail
- freshman, freshwoman
- friction
- friendless
- felicity
- flicker out
- flower-show
- front
- fossilology
- forced smile
- frosty
- ferocity
- festival
- full-bodied
- fuller's earth
- fully
- fully drawn
- festive
- fall to the ground