gray birch vs Betula populifolia

gray birch and Betula populifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
gray birch	Yes	No	No	No
Betula populifolia	Yes	No	No	No

As nouns, gray birch and Betula populifolia are synonyms defined as:

gray birch and Betula populifolia: medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree

Other synonyms of gray birch include American gray birch, American grey birch, grey birch.

gray birch (noun)	Betula populifolia (noun)
medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree	medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree