| sword | espada |
| Sword and sandal film | Peplum |
| Sword and sandal movie | Peplum |
| Sword and sorcery | Fantasía heroica |
| Sword Beach | Playa de Sword |
| Sword fighting | Esgrima |
| sword of Damocles | espada de Damocles |
| Sword swallowing | El tragar de la espada |
| swordfish | pez espada |
| Swordman | Acuchillardor |
| swordplay | esgrima |
| swordsman | espadachín |
| sworn | jurado |
| SWOT analysis | Análisis DAFO |
| Swung note | Swing |
| SX Arietis star | Estrellas SX Arietis |
| SX Phoenicis star | Estrellas SX Phoenicis |
| SXGA | WSXGA |
| Syagrius | Afranio Siagrio |
| Syagrus romanzoffiana | Syagrus romanzoffiana |
| Syaoran Li | Shaoran Li |
| Sybaris | Síbari |
| sybarite | sibarita |
| sybaritic | sibarítico |
| Syberia | Siberia |
| Sybill Trelawney | Sybill Trelawney |
| Sybille Bammer | Sybille Bammer |
| SYBR Green | SYBR Green |
| sycamore | sicómoro |
| sycamore maple | arce blanco |
| sycophant | pelota |
| Syd Barrett | Syd Barrett |
| Sydenham's chorea | corea de Sydenham |
| Sydney | Sídney |
| Sydney Brenner | Sydney Brenner |
| Sydney FC | Sydney Football Club |
| Sydney Harbour Bridge | Puente del puerto de Sídney |
| Sydney Olympic FC | Sydney Olympic Football Club |
| Sydney Opera House | Ópera de Sídney |
| Sydney Pollack | Sydney Pollack |
| Sydney racial violence continues | Disturbios raciales en la ciudad de Sydney |
| Sydney Swans | Sydney Swans Football Club |
| Sydney Tamiia Poitier | Sydney Poitier |
| Sydney to Hobart Yacht Race | Regata Sydney-Hobart |
| Syens | Syens |
| Sykes-Picot Agreement | Acuerdos Sykes-Picot |
| Syktyvkar | Syktyvkar |
| Syldavia | Syldavia |
| Syldavian | Idioma syldavo |
| Sylhet | Sylhet |
| Sylhet Division | Sylhet |
| syllabic | silábico |
| syllable | sílaba |
| Syllable rime | Rima |
| Syllable weight | Longitud de arco |
| syllabub | manjar de leche y licores |
| syllabus | programa |
| Syllabus of Errors | Syllabus |
| syllogism | silogismo |
| Sylvain Wiltord | Sylvain Wiltord |
| sylvan | selvático |
| Sylvanus Morley | Sylvanus Morley |
| Sylvester | Silvestre |
| Sylvester James | Sylvester |
| Sylvester Medal | Sylvester Medal |
| Sylvester Shyster | Lupus |
| Sylvester Stallone | Sylvester Stallone |
| Sylvia | Sylvia |
| Sylvia Nasar | Sylvia Nasar |
| Sylvia Plath | Sylvia Plath |
| Sylvia Scarlett | La gran aventura de Silvia |
| Sylvie Vartan | Sylvie Vartan |
| Sylvinho | Sylvio Mendes Campos Junior |
| sym- | sim- |
| Symantec | Symantec |
| Symbian Ltd | Symbian |
| Symbian OS | Symbian OS |
| Symbionese Liberation Army | Ejército Simbiótico de Liberación |
| symbiont | simbionte |
| symbiosis | simbiosis |
| symbiotic | simbiótico |
| Symbiotic nova | Nova simbiótica |
| Symbiotic star | Estrella simbiótica |
| symbol | emblema |
| symbolic | simbólico |
| Symbolic Capital | Capital social |
| Symbolic interactionism | Interaccionismo simbólico |
| Symbolic link | Enlace simbólico |
| symbolically | simbólicamente |
| symbolise | simbolizar |
| symbolism | simbolismo |
| symbolize | representar |
| symbology | simbología |
| Symi | Sime |
| Symmachus | Símaco |
| symmetric | simétrico |
| Symmetric multiprocessing | Multiprocesamiento simétrico |
| Symmetric polynomial | Polinomios simétricos |
| Symmetric-key algorithm | Criptografía simétrica |
| symmetrical | simétrico |
| symmetrically | simétricamente |
| symmetry | simetría |
| Symon Petliura | Symon Petlyura |
| Symon Petlura | Symon Petlyura |
| sympathetic | simpático |
| Sympathetic magic | Magia simpática |
| sympathetic nervous system | sistema nervioso simpático |
| sympathies | pésame |
| sympathize | compadecerse de |
| sympathize with | tener lástima a |
| sympathizer | partidaria |
| Sympathomimetic amine | Amina simpaticomimética |
| sympathy | afinidad |
| Sympatric speciation | Especiación simpátrida |
| Symphonia | Zanfona |
| symphonic | sinfónico |
| Symphonic black metal | Symphonic black metal |
| Symphonic metal | Symphonic metal |
| Symphonic rock | Rock sinfónico |
| Symphonie | Sinfonía |
| Symphonie fantastique | Sinfonía fantástica |
| symphony | sinfonía |
| symphony orchestra | orquesta sinfónica |
| Symphony X | Symphony X |
| Symphoricarpos | Symphoricarpos |
| Symplectic manifold | Topología simpléctica |
| Symplegades | Estrecho de Cinadea |
| Symplesiomorphy | Simplesiomorfia |
| symposium | conferencia |
| symptom | síntoma |
| symptomatic | sintomático |
