| Couleur | color colour trump caliber calibre hue kind |
| Couloir | couloir |
| Cougar | cougar |
| Coulomb | coulomb |
| Counter | counter |
| Couplet | couplet |
| Couture | couture |
| Oulu | Oulu |
| Poule | stake |
| Rouleau | blind |
| Joule | joule |
| Roulett | roulette |
| foulen | foul |
| fauler | hanky-panky |
| Heuler | seal pup |
| Schüler | pupil student disciple |
| Oleum | oleum |
| Jongleur | juggler |
| Souffleur | prompter prompt |
| Poseur | exhibitionist |