folie à deux/ˌfoli ah ʹduh (French fɔli a dø)/ noun (pl folies à deux /foliz ah ʹduh (French fɔliz a dø)/)

• flick through
• flier
• flight
• flight attendant
• flight capital
• flight control
• flight deck
• flight envelope
• flight feather
• flightless
• flight lieutenant
• flightline
• flight of fancy/the imagination
• flight path
• flight plan
• flight recorder
• flight sergeant
• flight simulator
• flighty
• flimflam
• flimsy
• flinch
• flinders
• fling
• flint