Ursus americanus vs Euarctos americanus

Ursus americanus and Euarctos americanus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ursus americanus	Yes	No	No	No
Euarctos americanus	Yes	No	No	No

As nouns, Ursus americanus and Euarctos americanus are synonyms defined as:

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

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

Ursus americanus (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