| Part of speech | common noun |
|---|---|
| Gender | common or neuter |
| Singular | Plural | |||
|---|---|---|---|---|
| Indefinite | Definite | Indefinite | Definite | |
| Nominative | koffein | koffeinen, koffeinet | ||
| Genitive | koffeins | koffeinens, koffeinets | ||
| Dutch | cafeïne; coffeïne |
|---|---|
| English | caffeine |
| Esperanto | kafeino |
| Faeroese | koffein |
| German | Koffein |
| Italian | caffeina |
| Papiamento | kafeina |
| Portuguese | cafeína |
| Spanish | cafeína |