| Konjunktur | economic situation boom |
| konjunktiv | conjunctive |
| Konjunktiv | subjunctive conjunctive mood conjunctive conjunctive mode |
| Konjektur | conjecture |
| Kondukteur | bus conductor |
| Konjunktion | conjunction |
| Kontraktur | contracture |
| Junktur | juncture juncture phoneme |
| Hochkonjunktur | boom |
| Konautor | coauthor |
| Kontur | contour outline |
| Junktor | sentential connective |
| Akupunktur | acupuncture |
| Jodtinktur | iodine |
| Korrektur | correction |
| Konduktion | conduction |
| Konfekt | candy |
| Konfucius | Confucius |
| Konfutse | Confucius |
| Konfuzius | Confucius |