What do you call a person who can speak different languages?
A "polyglot" is someone who knows several languages.
Someone who speaks two languages is bilingual, and if they speak two or more languages, they can be called multilingual. Someone who understands many languages can also be said to be a polyglot. A person who can speak two or more languages is multilingual. A person who can speak three languages is trilingual. A person who can speak only one language is monolingual.
A person that can speak two languages is bilingual, a person that can speak three languages is trilingual. So if we were to extrapolate this with Latin, the Latin root for all, is omni so then someone who knows all the languages, both on Earth, in humans and other species, on computers, in nature and on other planets. That very rare type of person would likely be described as omnilingual. Of course, if they just…
African people speak a variety of different languages. Without knowing which one you are asking about, this question is difficult to answer, since there are different words for money in Swahili, Luganda, Xhosa, and other African languages. But keep in mind that many Africans, just like many African-Americans, speak English, so they would call money by the English word "money" or by various slang words like "cash" or "dough" or "loot."