| konvivial | convivial |
| kongenial | congenial |
| Konkavität | concavity |
| Konvexität | convexity |
| Kondition | condition |
| Konditional | conditional conditional mood |
| Konizität | conicity |
| Konvoi | convoy |
| Konzil | council |
| Königin | queen |
| kongenital | congenital |
| konjugal | conjugal |
| konnatal | connatal |
| konziliant | conciliatory |
| Bonvivant | bon vivant |
| nonverbal | non-verbal |
| Olivia | Olivia |
| antiviral | antiviral |
| trivial | trivial |
| Monrovia | Monrovia |