Ursus arctos horribilis vs grizzly bear

Ursus arctos horribilis and grizzly bear both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ursus arctos horribilis	Yes	No	No	No
grizzly bear	Yes	No	No	No

As nouns, Ursus arctos horribilis and grizzly bear are synonyms defined as:

Ursus arctos horribilis and grizzly bear: powerful brownish-yellow bear of the uplands of western North America

Other synonyms of Ursus arctos horribilis include grizzly, silver-tip, silvertip, Ursus horribilis.

Ursus arctos horribilis (noun)	grizzly bear (noun)
powerful brownish-yellow bear of the uplands of western North America	powerful brownish-yellow bear of the uplands of western North America