| Part of speech | common noun |
|---|---|
| Gender | feminine |
| Singular | Plural | |
|---|---|---|
| Nominative | Oper | Opern |
| Genitive | Oper | Opern |
| Dative | Oper | Opern |
| Accusative | Oper | Opern |
| Catalan | òpera |
|---|---|
| Czech | opera |
| Danish | opera |
| Dutch | opera |
| English | opera |
| Esperanto | opero |
| Finnish | ooppera |
| Norwegian | opera |
| Papiamento | òpera |
| Polish | opera |
| Portuguese | ópera |
| Saterland Frisian | Oper |
| Spanish | ópera |
| Swedish | opera |