| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | citadelo | citadeloj |
| Accusative | citadelon | citadelojn |
| Catalan | ciutadella |
|---|---|
| Czech | citadela |
| Danish | citadel |
| Dutch | citadel |
| English | citadel |
| German | Zitadelle; Festung; Hochburg; Hort |
| Hungarian | citadella |
| Italian | cittadella |
| Portuguese | cidadela |
| Romanian | cetate |
| Saterland Frisian | Zitadelle |
| Spanish | ciudadela |