| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | filtrilo | filtriloj |
| Accusative | filtrilon | filtrilojn |
| Danish | filter |
|---|---|
| Dutch | filter |
| English | filter; cork |
| German | Filter |
| Italian | filtro |
| Norwegian | filter |
| Papiamento | felter; filtro |
| Portuguese | filtro |
| Spanish | filtro |
| Swedish | sil |