| Exosystem | exosystem |
| Ökosystem | ecosystem |
| Typsystem | type system |
| IT-System | IT system |
| Leitsystem | distributed control system |
| Subsystem | subsystem |
| System | system structure |
| Tonsystem | pitch space |
| Exonym | exonym xenonym |
| Wahlsystem | voting system |
| Sternsystem | star system |
| Größte | be-all and end-all |
| Exonymon | exonym |
| Exosphäre | exosphere |
| Exot | exotic |
| Exotik | exoticism |
| Exodus | Exodus Book of Exodus |
| Exogamie | exogamy |
| Exoplanet | exoplanet extrasolar planet |
| Exorzist | exorcist |