Bison bison vs buffalo

Bison bison and buffalo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bison bison	Yes	No	No	No
buffalo	Yes	No	Yes	No

As nouns, Bison bison and buffalo are synonyms defined as:

Bison bison and buffalo: large shaggy-haired brown bison of North American plains

Other synonyms of Bison bison include American bison, American buffalo.

Bison bison (noun)	buffalo (noun)
large shaggy-haired brown bison of North American plains	any of several Old World animals resembling oxen including, e.g., water buffalo, Cape buffalo
	large shaggy-haired brown bison of North American plains
	meat from an American bison

Bison bison (verb)	buffalo (verb)
	intimidate or overawe