| Synkope | syncope fainting |
| Synode | synod ecclesiastical council |
| Synopse | synopsis |
| Synagoge | synagogue synagog shul temple |
| Synapse | synapse |
| Apokope | apocope |
| Skopje | Skopje |
| Synesis | constructio ad sensum |
| Syndrom | syndrome |
| Synekdoche | synecdoche |
| Synergie | synergy |
| Synonym | synonym convertible terms equivalent terms synonymous word |
| synonym | synonymous |
| Synoptik | synoptic meteorology |
| Syntax | syntax |
| Synthese | synthesis |
| Syntänie | synteny |
| Ginko | ginkgo |
| Junko | snowbird |
| Mohnkopf | poppyhead |