| klassenbasiert | class-based |
| Klassenkasper | class clown |
| Klassenarbeit | class test exam |
| Klassenfahrt | school trip |
| Klassenkamerad | classmate |
| Klassenlehrer | class teacher homeroom teacher |
| Klassenzimmer | classroom schoolroom |
| Kassenwart | treasurer |
| Klassenvariable | class variable |
| Klatschbase | tattletale blabbermouth |
| Klausenburg | Cluj-Napoca |
| klassenlos | classless |
| Klassenkampf | class conflict |
| Klassenraum | classroom |
| Flaschenwasser | bottled water |
| Kassenbestand | cash flow |
| Gassenhauer | popular melody popular song |
| Kassensturz | cash check cashing-up |
| Flossenfüßer | pinniped |
| wissenswert | noteworthy worth knowing |