| Koagulation | coagulation |
| Kopulation | copulation |
| Koalition | coalition |
| Fabulation | fib |
| Ejakulation | ejaculation |
| Gratulation | congratulations gratulation |
| Kalkulation | calculation costing |
| Konfabulation | confabulation |
| Modulation | modulation |
| Ovulation | ovulation |
| Population | population |
| Postulation | postulation |
| Kollation | collating collation |
| Korrelation | correlation association |
| Stagflation | stagflation |
| Koedukation | coeducation |
| Konsultation | consultation |
| Kommutation | substitution test |
| Konjugation | conjugation |
| koagulieren | coagulate |