| Klärwerk | sewage treatment plant sewage work wastewater treatment plant |
| Klafter | fathom |
| Klammer | paper clip bracket parenthesis brace clamp |
| Klapper | rattle |
| Klarheit | clearness |
| Klartext | cleartext straight talk |
| Klavier | piano |
| Kläger | plaintiff |
| klackern | click |
| klammern | bracket cling |
| klappern | clatter click rattle |
| klarieren | clear |
| klären | clarify clear settle purge treat |
| Barwert | cash value present value |
| Fahrwerk | chassis |
| Fuhrwerk | wagon waggon |
| Kehrwert | reciprocal reciprocal value |
| Uhrwerk | clockwork |
| Gaswerk | gasworks |
| Bauwerk | building structure edifice |