| Klapper | rattle |
| klappern | clatter click rattle |
| Klappen | folding |
| klappen | fold work |
| klappe | cut |
| Klappe | flap mouth |
| Klapperpost | Clapper Post |
| Klappertopf | rattle |
| Klepper | dobbin |
| Klipper | clipper |
| Geklapper | clatter din |
| Klapp- | folding |
| Klapperkiste | jalopy |
| klappbar | collapsible |
| klapsen | fan |
| Klafter | fathom |
| Klammer | paper clip bracket parenthesis brace clamp |
| Klampe | cleat |
| Klavier | piano |
| Kläger | plaintiff |