| Klärgrube | septic tank |
| Baugrube | building pit construction pit |
| Kiesgrube | gravel pit gravel quarry |
| Karobube | jack of diamonds |
| Klagende | wailer |
| Klangfarbe | timbre |
| Klangtreue | fidelity |
| Klarspüler | rinse aid |
| Klage | lament complaint claim |
| Klartraum | lucid dream |
| Klaue | claw cloven hoof |
| Klause | hermitage splash dam |
| Klärung | clarification treatment |
| klarträumen | dream lucidly |
| klauben | collect sort out pick |
| Fallgrube | pitfall |
| Fanggrube | pitfall |
| Goldgrube | gold mine |
| Güllegrube | cesspool |
| Müllgrube | midden |