| Flachdach | flat roof |
| Flachland | lowland |
| flachmachen | flatten |
| Flachmann | hip flask pocket flask |
| Flashback | flashback |
| fachlich | disciplinary |
| Frechdachs | rascal |
| wrachtach | in fact indeed really truly |
| Flachheit | flatness |
| Flachwagen | flatcar |
| flämisch | Flemish |
| Flämisch | Flemish |
| Flachglas | flat glass plate glass sheet glass |
| Flachmoor | fen swamp |
| Flachs | flax |
| Flachse | tendon |
| Flansch | flange |
| Fläche | surface area |
| flach | flat shallow |
| flachsen | joke kid wisecrack |