water birch vs Betula fontinalis

water birch and Betula fontinalis both are nouns.

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

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

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

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

water 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