| klappbar | collapsible |
| Klapper | rattle |
| Klapp- | folding |
| Klappbett | shakedown |
| Klappen | folding |
| klappen | fold work |
| aufklappbar | collapsible |
| ausklappbar | foldout |
| klappe | cut |
| Klappe | flap mouth |
| klappern | clatter click rattle |
| klapprig | ramshackle rickety shaky tottery |
| lapidar | lapidary succinct |
| Kappa | kappa |
| Geklapper | clatter din |
| Klaipėda | Klaipėda |
| Klara | Clara |
| Klathrat | clathrate |
| Klausner | anchorite hermit |
| glasklar | crystal clear limpid |