| Klathrat | clathrate |
| Clathrat | clathrate |
| Klara | Clara |
| Klarheit | clearness |
| Lateran | Lateran |
| Flatrate | flatrate |
| Lateral | lateral |
| lateral | lateral |
| Kastrat | castrato |
| Literat | literati |
| Elaborat | concoction drawing up |
| Karat | carat karat |
| Klanglaut | sonorant |
| Klassist | classist |
| klappbar | collapsible |
| Klaas | Nick |
| Klafter | fathom |
| Klartext | cleartext straight talk |
| Klartraum | lucid dream |
| Klatsch | gossip |