Betula fontinalis vs mountain birch

Betula fontinalis and mountain birch both are nouns.

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

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

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

Other synonyms of Betula fontinalis include swamp birch, water birch, Western birch, Western paper birch.

Betula fontinalis (noun)	mountain birch (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