| flach | flat shallow |
| Flachs | flax |
| Fläche | surface area |
| Flachse | tendon |
| flachsen | joke kid wisecrack |
| Flachheit | flatness |
| Flachland | lowland |
| Flachdach | flat roof |
| Flachglas | flat glass plate glass sheet glass |
| Flachmann | hip flask pocket flask |
| Flachmoor | fen swamp |
| Fach | compartment discipline field subject |
| Flachlegen | takedown |
| flachlegen | lay do |
| Flachwagen | flatcar |
| Flag | flag |
| Flair | flair bill |
| Flachfeile | flat file |
| Flak | flak |
| Flame | Fleming flame |