| Quasisynonym | near-synonym quasi-synonym |
| Basionym | basionym basinym |
| Synonym | synonym convertible terms equivalent terms synonymous word |
| synonym | synonymous |
| Qualifying | qualifying |
| quasistationär | quasi-stationary quasistatic |
| quasseln | blether |
| anonym | anonymous |
| Astronym | astronym |
| Aquaristin | aquarist |
| Qualifikant | qualifier |
| Quaternion | quaternion |
| Quadrillion | septillion |
| Quadrofonie | quadraphonic sound |
| Quantum | quantum |
| Quarkonium | quarkonium |
| Quassie | quassia |
| Quästor | quaestor |
| quasi | quasi sort of virtually |
| quasistatisch | quasistatic |