| Klarinettist | clarinetist |
| Klarinettistin | clarinetist |
| Klarinette | clarinet clarionet |
| Kabarettist | cabaret artist |
| Klarheit | clearness |
| Laryngitis | laryngitis |
| Karikaturist | caricaturist cartoonist |
| Kabinett | cabinet |
| Karrierist | careerist |
| Latinist | Latinist |
| Kleingeist | small-minded person |
| Klappbett | shakedown |
| Klappentext | blurb |
| Klapperkiste | jalopy |
| Klassist | classist |
| Klapperpost | Clapper Post |
| Klartext | cleartext straight talk |
| klandestin | clandestine |
| klarieren | clear |
| Alarmist | alarmist |