| Part of speech | common noun |
|---|---|
| Hyphenation | ka·stor·o |
| Singular | Plural | |
|---|---|---|
| Nominative | kastoro | kastoroj |
| Accusative | kastoron | kastorojn |
| Catalan | castor |
|---|---|
| Chinook Jargon | ina |
| Czech | bobr |
| Danish | bæver |
| Dutch | bever |
| English | beaver; castor |
| English (Old English) | befer; beofor |
| Faeroese | bævur |
| French | castor |
| German | Biber |
| Greek | κάστορας; καστόρι |
| Italian | castoro |
| Latin | castor |
| Luxemburgish | Biber |
| Norwegian | bever |
| Portuguese | castor |
| Russian | бобр |
| Spanish | castor |
| Swedish | bäver |
| Turkish | kunduz |
| Welsh | afanc; llostlydan |
| West Frisian | bever |