| Part of speech | common noun |
|---|---|
| Gender | common |
| Singular | Plural | |||
|---|---|---|---|---|
| Indefinite | Definite | Indefinite | Definite | |
| Nominative | søster | søsteren | søstre | søstrene |
| Genitive | søsters | søsterens | søstres | søstrenes |
| Afrikaans | suster |
|---|---|
| Albanian | motër |
| Catalan | germana |
| Czech | sestra |
| Dutch | zus; zuster |
| English | sister |
| English (Old English) | sweostor; swestor |
| Esperanto | fratino |
| Faeroese | systir |
| French | sœur |
| German | Schwester |
| Greek | αδελφή; αδέλφή |
| Hungarian | lánytestvér |
| Icelandic | systir |
| Italian | sorella |
| Jamaican Patois | sista |
| Latin | soror |
| Low German | süster |
| Luxemburgish | Schwëster; Sëschter |
| Norwegian | søster |
| Papiamento | ruman mohé; ruman muhé |
| Polish | siostra |
| Portuguese | irmã |
| Romanian | soră |
| Russian | сестра |
| Saterland Frisian | Suster |
| Scottish Gaelic | piuthar |
| Spanish | hermana |
| Sranan | sisa |
| Swahili | dada |
| Swedish | syster |
| Turkish | kız kardeş |
| Welsh | chwaer |
| West Frisian | suster; sus |
| Yiddish | שװעסטער |