Ursus americanus vs American black bear

Ursus americanus and American black bear both are nouns.

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

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

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

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

Ursus americanus (noun)	American black bear (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