American grey birch vs Betula populifolia

American grey birch and Betula populifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
American grey birch	Yes	No	No	No
Betula populifolia	Yes	No	No	No

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

American grey 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 American grey birch include American gray birch, gray birch, grey birch.

American grey 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