| klar | clear lucid obvious ready of course |
| Klara | Clara |
| klären | clarify clear settle purge treat |
| Klärung | clarification treatment |
| Klan | clan |
| Klarheit | clearness |
| Klartext | cleartext straight talk |
| Klärwerk | sewage treatment plant sewage work wastewater treatment plant |
| Klärgrube | septic tank |
| unklar | ambiguous indistinct |
| Eiklar | albumen egg white |
| Eklat | scandal stir |
| Klaas | Nick |
| Klage | lament complaint claim |
| Klamm | gorge ravine canyon |
| klamm | clammy cash-strapped |
| Klang | sound ring tone chord harmony |
| Klaps | clap |
| Klartraum | lucid dream |
| Klaue | claw cloven hoof |