Ursus americanus vs black bear

Ursus americanus and black bear both are nouns.

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

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

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

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

Ursus americanus (noun)	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
	bear with a black coat living in central and eastern Asia