| Part of speech | common noun |
|---|---|
| Hyphenation | dek ok |
| ? | |
|---|---|
| Afrikaans | agtien |
| Albanian | tetëmbëdhjetë |
| Catalan | divuit |
| Danish | atten |
| Dutch | achttien |
| English | eighteen |
| English (Old English) | eahtatiene |
| Finnish | kahdeksantoista |
| French | dix‐huit |
| German | achtzehn |
| Greek | δεκαοκτώ; δεκαοχτώ |
| Hungarian | tizennyolc |
| Icelandic | átján |
| Italian | diciotto |
| Jamaican Patois | hietiin |
| Latin | duodeviginti |
| Low German | achttein |
| Luxemburgish | uechtzéng |
| Norwegian | atten |
| Papiamento | djesocho; diesocho |
| Polish | osiemnaście |
| Portuguese | dezoito |
| Saterland Frisian | achttien |
| Spanish | dieciocho |
| Sranan | tina‐ayti |
| Swahili | kumi na -nane; kumi na nane |
| Swedish | aderton; arton |
| Tagalog | labingwaló |
| Thai | สิบแปด |
| Welsh | deunaw; un deg wyth |
| West Frisian | achttjin; achttsjin |