| flügges Kücken | fledgling |
| flügges Küken | fledgling |
| flügger Vogel | fledgling |
| Flagge zeigen | nail one's colours to the mast show one's colours show one's true colors show the flag |
| geh kacken | to piss off |
| Flugasche | fly ash |
| Fluggeschoss | missile |
| Flughörnchen | flying squirrel |
| Flugschein | pilot's licence air ticket flight ticket |
| Flugticket | flight ticket |
| Flüsschen | rivulet creek stream |
| fluoreszieren | fluoresce |
| flutschen | slide |
| Flaggenkunde | vexillology |
| ausgesprochen | downright pronounced |
| grünes Lachen | gallows humor |
| Fußrücken | instep |
| Zungenrücken | dorsum |
| Blut lecken | taste blood |
| Flecken | stain |