FM (frequency modulation) wave
FMP (Function Management Protocol)
f.m.s
f.o.
f.o
foal
foam
foam rubber
foamed
foamer
foamglass
foaming
foamless
foamy
fob
focal
focal length
focal plane
focal point
focalise
focalization
focalize
foci
fo'c'sle
focus
focus coil
focus servo system
focused
focusing magnet
fodder