| Klarinette | clarinet clarionet |
| Klarinettist | clarinetist |
| Marionette | puppet marionette |
| Kabinett | cabinet |
| Lorgnette | lorgnette |
| Karmette | Tenebrae |
| Bassklarinette | bass clarinet |
| Klappbett | shakedown |
| Klamotte | big lump of rock rag rock stone brick shattered dirt gear junk book old oldie play trashy ham lowbrow farce bawdy cheap droll drollery riotous |
| Klarheit | clearness |
| Klartext | cleartext straight talk |
| Kläranlage | sewage treatment plant wastewater treatment plant |
| klarieren | clear |
| Varietee | variety show |
| kariert | chequered checked checkered |
| Korinthe | currant |
| Kaminecke | fireside |
| Reinette | reinette |
| Lunette | lunette |
| Lünette | lunette |