[Shatnerz]

Buffalo and Bison are often interchangeable in American English.

I know in Polish, "żubr", which is the European Bison, is often translated as buffalo and the American Bison is known as "bizon" which is understandably translated as bison. I would not be surprised if Belarusian was similar.

[aix1]

In Belarusian it's indeed "амерыканскі бізон" and "еўрапейскі зубр" (American bison and European zubr). In everyday speech these are shortened to "bison" and "zubr".

And buffalo (like African and water) is "буйвал".

I had no idea American English used "buffalo" and "bison" interchangeably.

Learn something every day. :)