| sperimentato | tried |
| sperimentazione | experimentation |
| sperimentazione animale | animal experiment |
| sperma | semen |
| spermaceti | spermaceti |
| spermato- | spermato- |
| spermatofita | spermatophyte |
| Spermatophyta | Spermatophyte |
| spermatozoi | spermatozoa |
| Spermatozoide | Spermatozoon |
| spermatozoo | spermatozoon |
| spermicida | spermicide |
| Spermophilus | Spermophilus |
| Spermophilus beecheyi | California Ground Squirrel |
| Spermophilus citellus | European Ground Squirrel |
| Spermophilus lateralis | Golden-mantled Ground Squirrel |
| spero | hopefully |
| speronare | hit |
| sperone | spur |
| speronella | delphinium |
| Speroni galattici | Galactic spurs |
| sperperare | waste |
| sperperato | wastes |
| sperpero | waste |
| Sperrylite | Sperrylite |
| spersonalizzare | depersonalize |
| spesa | expenditure |
| spesa delle famiglie | household expenditure |
| spesa pubblica | public expenditure |
| spese | expenditure |
| spese di gestione | operating expenses |
| spese di manutenzione | maintenance |
| spese di viaggio | travelling expenses |
| spese folli | shopping spree |
| spese generali | overhead |
| spese operative | operating expenses |
