| Flachbandkabel | ribbon cable |
| Flachländer | lowlander |
| Fachhandel | specialized trade |
| Flachland | lowland |
| Flaschendeckel | bottle cap |
| Lachanfall | laughing fit |
| Flachkopfkatze | flat-headed cat |
| Flachsfaser | flax |
| Flachwagen | flatcar |
| Flaschendrehen | spin the bottle |
| Flächeinhalt | area |
| flachmachen | flatten |
| Flachbaugruppe | printed circuit board |
| Flachdach | flat roof |
| Flachmann | hip flask pocket flask |
| Flashback | flashback |
| Flauschband | loop tape |
| Flächenbrand | surface fire |
| flachsfarben | flaxen |
| flächendeckend | comprehensive |