- flattening test
- flaunt
- flax
- fleaking
- flee
- Flemish bond
- flex-wire
- flexible bar
- flexible box
- flexible connection
- flexible coupling
- flexible drive
- flexible duct
- flexible form
- flexible hanger
- flexible metal
- flexible panel
- flexible pier
- flexible pipeline
- flexible plate
- flexible roof
- flexible sheath
- flexion
- flexural centre
- flexural cracking
- flexural displacement
- flexural resistance
- flexural strain
- flexural stress
- flier
- flight
- flight header
- flight lock
- flight stairs
- flint brick
- flint glass
- flirt
- flitch beam
- float tank
- floatage
- floatation activity
- floatation mill
- floatation trap
- floated concrete
- floating
- floating beacon
- floating boom
- floating breakwater
- floating bulkhead
- floating crane
- floating dock
- floating dredger
- floating floor
- floating harbour
- floating ice
- floating installation
- floating method
- floating pipeline
- floating scaffold
- floating structure
- floating support
- floating toolbar
- flocculation basin
- flocculation tank
- flogging
- flood bank
- flood bed
- flood discharge
- flood fighting
- flood frequency
- flood hydrograph
- flood mark
- flood reservation
- flood spillway
- floodable zone
- flooded dyke
- floodgate
- flooding irrigation
- flooding line
- floor
- floor area
- floor block
- floor boarding
- floor cloth
- floor component
- floor cover
- floor depth
- floor duct
- floor framing
- floor guide
- floor light
- floor nail
- floor outlet
- floor paint
- floor plan
- floor slab
- floor ventilation
- floorage
- flooring
- flooring nail