American buffalo vs buffalo

American buffalo and buffalo both are nouns.

Word	Noun	Adjective	Verb	Adverb
American buffalo	Yes	No	No	No
buffalo	Yes	No	Yes	No

As nouns, American buffalo and buffalo are synonyms defined as:

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

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

American buffalo (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

American buffalo (verb)	buffalo (verb)
	intimidate or overawe