There are 203 sovereign nations in the world. You can fudge that number either way a few digits depending on who your nation of origin does or does not formally recognize bu that's about right. I tried to cover at least all of the 30 most commonly spoken languages here but did miss a few. Punjabi, Javanese, Marathi, and Burmese. There are approximately 6,600 languages spoken in the world today, and almost all of them have a word for radio, since radio is truly heard everywhere.
Cantonese: Sau jam gei
Vietnamese: đài phát thanh