flexible disk = floppy disk
Flexible exchange rate
flexible (printed) circuit
flexibly
flexile
flexility
flexing
flexion
flexional
flexionless
Flexitime
flexographic
flexography
flexor
flexouse
flexousity
flexowriter
flexuosity
flexuous
flexural
flexure
fley
flibbertigibbet
flic
flicflac
flick
flick-knife
flicker
flicker-mouse
flickering