Populus alba vs white poplar

Populus alba and white poplar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Populus alba	Yes	No	No	No
white poplar	Yes	No	No	No

As nouns, Populus alba and white poplar are synonyms defined as:

Populus alba and white poplar: a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces

Other synonyms of Populus alba include abele, aspen poplar, silver-leaved poplar, white aspen.

Populus alba (noun)	white poplar (noun)
a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces	a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces
	light easily worked wood of a tulip tree; used for furniture and veneer