| Klassenclown | class clown |
| klassenlos | classless |
| Klappenloch | glory hole |
| Klassenpfad | classpath |
| Klassenfahrt | school trip |
| Klassenkampf | class conflict |
| Klassenraum | classroom |
| Gruselclown | scary clown |
| Klinikclown | clinic clown hospital clown |
| Klassenkasper | class clown |
| Klatschen | clap |
| klatschen | clap slap smack splash gossip backbite mardle |
| Klausenburg | Cluj-Napoca |
| klapsen | fan |
| Klasse | class |
| klasse | great awesome |
| Klassem | classeme |
| Klassenarbeit | class test exam |
| Klassenlehrer | class teacher homeroom teacher |
| Klassentreffen | class reunion |