aspen poplar vs Populus alba

aspen poplar and Populus alba both are nouns.

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

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

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

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

aspen poplar (noun)	Populus alba (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