flap·per 
(flăpər)
(flăpər)n.
1. A broad flexible part, such as a flipper.
2. A young woman of the 1920s who rebelled against conventional ideas of ladylike behavior and dress.
[Sense 2, British Slang, very young female prostitute, flapper, possibly from flapper, fledgling partridge or duck (from FLAP) or from dialectal flap, loose or flighty girl.]
- forsythia
- fort
- Fort
- Fortaleza
- fortalice
- Fortas
- Fort Collins
- Fort-de-France
- forte
- forte
- forte-piano
- fortepiano
- forth
- Forth
- for that matter
- forthcoming
- for the best
- for the better
- for the birds
- for the hell of it
- for the life of
- for the life of (one)
- for the life of one
- for the love of
- for the most part