| Klartext | cleartext straight talk |
| Klarheit | clearness |
| Klafter | fathom |
| Klärwerk | sewage treatment plant sewage work wastewater treatment plant |
| klären | clarify clear settle purge treat |
| Karte | card map chart menu ticket |
| Kartei | card catalog card index |
| Kartell | cartel |
| Quartett | quartet quartette |
| geartet | natured |
| karteln | play cards |
| Kortex | cortex |
| Urtext | urtext |
| Latex | latex |
| LaTeX | LaTeX |
| Lauftext | marquee |
| Prätext | pretext |
| Kontext | context |
| Kotext | cotext |
| Klagen | lament |
| klagen | wail lament whinge complain sue bring an action go to court |