F字母开头的单词或词组(第18页)：
- flimsy
- flinch
- flint
- flip
- flippant
- flirt
- flit
- flock
- floodgate
- flora
- florid
- flounder
- flourish
- flout
- fluctuate
- fluffy
- fluke
- fluorescent
- flush
- flustered
- fluvial
- foodstuff
- foment
- flutter
- flux
- foible
- foil
- fold
- folder
- foliage
- folklore
- folly
- foolproof
- foppish
- forage
- forager
- forbearance
- ford
- forbidding
- forbid
- forebode
- foreknowledge
- forerunner
- foreshadow