Merriam-Webster's Collegiate Dictionary:
fanfold
fang
fanged
fanlight
fanlike
fanner
fanning island
fanny
fanny pack
fantabulous
fantail
fantasia
fantasied
fantasise
fantasist
fantasize
fantasizer
fantasm
fantast
fantastic
fantastical
fantasticality
fantastically
fantasticalness
fantasticate
fantastication
fantastico
fantasy
fantasy fiction
fantasyland
fantoccini
fantod
fanwise
fanzine
fao
faq
far
far and away
far and wide
far be it from
far cry
far east
far eastern
far from
far-fetched
far-flung
far-infrared
far-off
far-out
far-outness
far-reaching
far-red
far-ultraviolet
farad
faradaic
faraday
faradic
faradism
farallon islands
farandole
faraway
farce
farceur
farci
farcical
farcicality
farcically
farcie
farcy
fard
fardel
fare
fare-thee-well
fare-you-well
farewell
farewell, cape
farfal
farfalle
farfel
farfetchedness
fargo
farina
farinaceous
farinha
farkleberry
farl
farley
farm
farm out
farman
farmer
farmer cheese
farmer's lung
farmerette
farmers branch
farmhand
farmhouse
