Floccinaucinihilipilification is the longest word starting with F; it means the act of estimating something as worthless.
forethoughtfulness
firetruck
Faust
Florsheim
Flamingo
The world's fastest bird starting with "peregrine f" is the Peregrine Falcon. It is known for its incredibly fast diving speeds while hunting prey in mid-air.
freezer from incredable's
feather hat fedora
Felix.
Fife, Falkirk, Faversham...
Faroese