black bear vs Ursus thibetanus

black bear and Ursus thibetanus both are nouns.

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

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

black bear and Ursus thibetanus: bear with a black coat living in central and eastern Asia

Other synonyms of black bear include Asiatic black bear, Selenarctos thibetanus.

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