| Typsystem | type system |
| Tonsystem | pitch space |
| Exosystem | exosystem |
| IT-System | IT system |
| Lymphsystem | lymphatic system |
| Subsystem | subsystem |
| System | system structure |
| Ökosystem | ecosystem |
| Dateisystem | file system |
| Notensystem | stave |
| Untersystem | sub-system |
| Wahlsystem | voting system |
| Leitsystem | distributed control system |
| Oktalsystem | octal numeral system |
| Sternsystem | star system |
| Type | letter type |
| Typhus | typhoid typhoid fever |
| Typus | type |
| typisch | typical |
| Psyche | mind psyche |