| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | altruisto | altruistoj |
| Accusative | altruiston | altruistojn |
| Czech | altruista |
|---|---|
| Dutch | altruïst |
| English | altruist |
| French | altruiste |
| German | Altruist |
| Portuguese | altruísta; filantropo |
| Saterland Frisian | Altruist |
| Spanish | altruista |