| Part of speech | unknown part of speech |
|---|
| Afrikaans | hoekom; waarom |
|---|---|
| Catalan | per què |
| Dutch | waarom; weshalve; vanwaar |
| English | why |
| Esperanto | kial; pro kio |
| French | pourquoi |
| German | warum; weshalb |
| Italian | perché |
| Low German | wårümme; wårum |
| Luxemburgish | firwat |
| Norwegian | hvorfor |
| Papiamento | pakiko; kon |
| Scots | why |
| Spanish | por qué |
| Sranan | fu san ede |
| Thai | ทำไม |
| West Frisian | wêrom |
| Yiddish | פֿאַרװאָס |