| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | indekso | indeksoj |
| Accusative | indekson | indeksojn |
| Catalan | índex |
|---|---|
| Czech | rejstřík; seznam |
| Dutch | index; inhoudsopgave; register |
| English | index |
| German | Index; Register; Verzeichnis |
| Luxemburgish | Verzeechnes; Index |
| Portuguese | índex |
| Saterland Frisian | Ferteeknis; Index; Register |
| Spanish | índice |