| Coup d’État | coup coup d’état |
| Couplet | couplet |
| Coupé | coupé coupe |
| Duplizität | duplicity |
| Komplizität | complicity |
| Opazität | opacity |
| Komplexität | complexity |
| Morbidität | morbidity |
| Solidität | solidity |
| Coulombkraft | Coulomb force |
| Cougar | cougar |
| Count | count |
| Countdown | countdown |
| Counter | counter |
| Country | country |
| County | county |
| Coup | coup |
| Coupage | coupage |
| Couperose | copperas |
| Coupon | coupon |