| Quadrivium | quadrivium |
| Quadratum | quadrate bone |
| Quadrieren | quadrature |
| quadrieren | square |
| Aquarium | aquarium tank |
| Quadratur | quadrature |
| Quadriga | quadriga |
| Quadrille | quadrille |
| Quadrillion | septillion |
| Quadrizeps | quadriceps |
| Quarkonium | quarkonium |
| Trivium | trivium |
| Ladinium | Ladinian |
| Untribium | untribium |
| Quadratfuß | square foot |
| Quadrupede | quadruped |
| Quartil | quartile |
| Quarzit | quartzite |
| Squadrist | blackshirt |
| Squadristin | blackshirt |