| Synesis | constructio ad sensum |
| Genesis | Genesis Book of Genesis |
| Synergie | synergy |
| Sienesin | Sienese |
| Amnesie | amnesia |
| Nemesis | Nemesis |
| Tmesis | tmesis |
| Syllepsis | syllepsis |
| Gnosis | gnosticism gnostics gnosis |
| Myiasis | myiasis |
| Sepsis | sepsis |
| Skepsis | skepticism |
| Stasis | stasis |
| Syndesmose | syndesmosis |
| Synapse | synapse |
| Syndrom | syndrome |
| Synkope | syncope fainting |
| Synkretist | syncretist |
| Synode | synod ecclesiastical council |
| Synonym | synonym convertible terms equivalent terms synonymous word |
| synonym | synonymous |