| Kassenzettel | sales slip receipt |
| Kassetten | coffer |
| Kassette | cassette |
| Klebezettel | post-it note |
| Kassenbestand | cash flow |
| Kastagnette | castanet |
| Kasematte | casemate |
| Kassensturz | cash check cashing-up |
| Kassenwart | treasurer |
| Massenanteil | mass fraction |
| Massenmedien | mass media |
| Klassenlehrer | class teacher homeroom teacher |
| Klassenzimmer | classroom schoolroom |
| Massenzahl | mass number |
| Wasserbett | waterbed |
| Wasserkessel | kettle |
| Wasserratte | water vole |
| massenweise | galore scores of |
| Aussenseiter | misfit |
| Außenseiter | outsider |