- first aid
- first arrival
- first runner
- fish eye
- fish job
- fish oil
- fishing socket
- fishing time
- fishing tool
- fission
- fissured
- fitting pipe
- fiveway cock
- fix
- fixative
- fixed axle
- fixed capital
- fixed carbon
- fixed configuration
- fixed datum
- fixed elevation
- fixed grease
- fixed ignition
- fixed oil
- fixed pump
- fixed royalty
- fixing agent
- fixing bath
- fixing salt
- fixture
- fizz
- fkinkite
- flake
- flake graphite
- flaked
- flaked bearing
- flaker
- flaking
- flaky
- flambeau light
- flamboyant quartz
- flame arrester
- flame coal
- flame coloration
- flame cutting
- flame ignition
- flame propagation
- flame resistance
- flame test
- flame velocity
- flame-proof
- flame-retardant
- flameless combustion
- flaming coal
- flammable
- flammable liquid
- flange gasket
- flange steel
- flange up
- flanged
- flanged fittings
- flanged joint
- flanged tees
- flanged valve
- flank fissure
- flank moraine
- flank well
- flap valve
- flare
- flare gas
- flare pit
- flaring
- flash
- flash balloon
- flash carbonization
- flash column
- flash distillation
- flash drum
- flash fire
- flash mold
- flash mould
- flash process
- flash strike
- flash tank
- flash tower
- flash vaporization
- flash-drying
- flashing flow
- flashing pump
- flask
- flat
- flat coast
- flattened
- flattish relief
- flesh
- flexible coupling
- flexible film
- flexible foam
- flexible plate
- flexure test