white aspen vs Populus alba

white aspen and Populus alba both are nouns.

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

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

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

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

white aspen (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