| Quadrofonie | quadraphonic sound |
| Quadrocopter | quadcopter |
| Quadrokopter | quadcopter |
| Kakofonie | cacophony |
| Quadriplegie | quadriplegia |
| Quadrupede | quadruped |
| Quadrant | quadrant |
| Quadratmeile | square mile |
| Quadrille | quadrille |
| Quarkonium | quarkonium |
| quaderförmig | cuboid cuboidal |
| quadratförmig | square square-shaped |
| Dendrologie | dendrology |
| Androgynie | androgyne |
| Andrologie | andrology |
| Hydrologie | hydrology |
| Frankofone | Francophone |
| Baronie | barony |
| Harmonie | harmony |
| Kapkolonie | Cape Colony |