| sinyal | |
| sinyál | |
| sinyalar | |
| sinyatura | |
| sinyifikar | |
| sinyifikasion | |
| sinyo | |
| sinyor | |
| sinyór | |
| sinyóra | |
| sirá | |
| sirkular | |
| sirkulasion | |
| Sirkulo Polar Antartiko | |
| Sirkulo Polar Artiko | |
| sirkunstansia | |
| Sisilia | |
| sisne | |
| sistema | |
| Sistema solar | |
| sitio | |
| situar | |
| situasion | |
| Sivdad | |
| sivdad | |
| Sivdad del Vatikano | |
| sivil | |
| siya | |
| Skiptvet | |
| Skosia | |
| snauzeri | |
| sodio | |
| soko | |
| Sol | |
| sol | |
| solamente | |
| soldado | |
| soleado | |
| soledad | |
| solo | |
| solombra | |
| soltero | |
| sólu | |
| solusion | |
| someter | |
| Somme | |
| son | |
| sonár | |
| sone | |
| sonéte | |
| Ladino |