| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | duelo | dueloj |
| Accusative | duelon | duelojn |
| Dutch | duel; tweegevecht; tweekamp |
|---|---|
| English | duel |
| German | Duell; Zweikampf |
| Hungarian | párbaj |
| Italian | duello |
| Portuguese | duelo |
| Spanish | desafío; duelo |
| Swedish | envig; tvekamp |
| Turkish | düello |
| West Frisian | kampslach; twakamp |