| Part of speech | common noun |
|---|---|
| Plural | secrets |
| Afrikaans | geheim |
|---|---|
| Catalan | secret |
| Danish | hemmelighed |
| Dutch | geheim |
| English (Old English) | diegelnes |
| Esperanto | sekreto |
| Faeroese | loyndarmál |
| French | secret; arcane |
| German | Geheimnis |
| Hungarian | titok |
| Italian | segreto |
| Papiamento | misterio; sekreto; sekretu |
| Polish | tajemnica |
| Portuguese | segredo; sigilo |
| Saterland Frisian | Stilkenes |
| Spanish | secreto |
| Ukrainian | тайна |
| West Frisian | geheim |