American black bear vs Euarctos americanus

American black bear and Euarctos americanus both are nouns.

Word	Noun	Adjective	Verb	Adverb
American black bear	Yes	No	No	No
Euarctos americanus	Yes	No	No	No

As nouns, American black bear and Euarctos americanus are synonyms defined as:

American black bear and Euarctos americanus: brown to black North American bear; smaller and less ferocious than the brown bear

Other synonyms of American black bear include black bear, Ursus americanus.

American black bear (noun)	Euarctos americanus (noun)
brown to black North American bear; smaller and less ferocious than the brown bear	brown to black North American bear; smaller and less ferocious than the brown bear