Romance Languages:
* Spanish: lluvia
* French: pluie
* Italian: pioggia
* Portuguese: chuva
* Romanian: ploaie
Germanic Languages:
* German: Regen
* Dutch: regen
* Swedish: regn
* Danish: regn
* Norwegian: regn
* English: rain (of course!)
Slavic Languages:
* Russian: дождь (dozhd')
* Polish: deszcz
* Czech: déšť
* Slovak: dážď
* Ukrainian: дощ (doshch)
Other Languages:
* Chinese: 雨 (yǔ)
* Japanese: 雨 (ame)
* Korean: 비 (bi)
* Hindi: बारिश (barish)
* Arabic: مطر (matar)
* Greek: βροχή (vrochi)
* Turkish: yağmur
This is just a small sampling of languages. There are many other languages and dialects that have different ways of saying "rain."