| Part of speech | common noun |
|---|---|
| Hyphenation | ka·stel·o |
| Singular | Plural | |
|---|---|---|
| Nominative | kastelo | kasteloj |
| Accusative | kastelon | kastelojn |
| Afrikaans | kasteel; slot |
|---|---|
| Catalan | castell |
| Danish | slot |
| Dutch | burcht; kasteel; slot |
| English | castle |
| Faeroese | borg |
| French | château |
| German | Burg; Kastell; Schloß; Schiffsaufbau; Aufbau |
| Hungarian | vár |
| Italian | castello |
| Latin | arx; turris |
| Norwegian | slott |
| Papiamento | kastel; kastio |
| Polish | zamek |
| Portuguese | castelo |
| Saterland Frisian | Buurich; Kastäil; Slot |
| Scots | castle |
| Scottish Gaelic | caisteal |
| Spanish | castillo |
| Swedish | borg; slott |
| Tagalog | kastilyo |
| Welsh | castell |
| West Frisian | kastiel; slot |