Western birch vs Betula fontinalis

Western birch and Betula fontinalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Western birch	Yes	No	No	No
Betula fontinalis	Yes	No	No	No

As nouns, Western birch and Betula fontinalis are synonyms defined as:

Western birch and Betula fontinalis: birch of western United States resembling the paper birch but having brownish bark

Other synonyms of Western birch include mountain birch, swamp birch, water birch, Western paper birch.

Western birch (noun)	Betula fontinalis (noun)
birch of western United States resembling the paper birch but having brownish bark	birch of western United States resembling the paper birch but having brownish bark