- flee from
- fleer
- flench
- flesh
- fleshy
- flexion
- flick
- flick through
- flight simulator
- fling or sling mud
- flip flopper
- float
- floating
- flog
- floorer
- flop
- flower-leaf
- flowering plant
- flowing
- fluent words
- fluky
- fluorescence
- fluoride
- flurried
- fluted
- fluxionary
- fly go out of the window
- fly into rage
- fly of the handle
- fly-fishing
- flying jump
- flyweight
- foamless
- fog lamp
- foible
- folder
- foliage
- follow
- follow lead
- follow out
- fondue
- foolish fellow
- foot movement
- foot stone
- football pool
- footing
- footsore
- for an old song
- foray
- forbearing
- foreboding
- foregoing
- foreign country
- foreigner
- foreman, forewoman
- foreordained
- foreshadow
- forever
- forfeiture
- formic
- formica compressa
- fornication
- forswear
- forte
- fortieth
- fortuitous
- fortune teller
- forum
- forwards
- foul
- funk
- foyer
- fractious
- fragile
- frail
- frame-up
- frantic
- fratricide
- freaky
- free
- free rein
- freely
- fresh butter
- fresh-water snail
- freshman, freshwoman
- friction
- friendless
- frigid
- frisk
- frivol
- frog leap
- frolicsome
- from cradle to the grave
- frowsty
- front
- frosty
- fruitful
- fuel
- fuelled
- fugitive