| Klangtreue | fidelity |
| Klangfarbe | timbre |
| Klanglaut | sonorant |
| Klärgrube | septic tank |
| Klartraum | lucid dream |
| Langstrecke | long haul |
| lang lebe | long live |
| Känguru | kangaroo macropod |
| Königstreue | royalism |
| Untreue | unfaithfulness disloyalty embezzlement infidelity |
| Klagen | lament |
| klagen | wail lament whinge complain sue bring an action go to court |
| Klagende | wailer |
| Klamotten | clothes |
| Klangwort | onomatopoeia |
| Klaugemauer | Western Wall |
| klagend | plaintive |
| Klafter | fathom |
| Klage | lament complaint claim |
| Klagemauer | Wailing Wall Western Wall |