silver-leaved poplar vs white aspen

silver-leaved poplar and white aspen both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver-leaved poplar	Yes	No	No	No
white aspen	Yes	No	No	No

As nouns, silver-leaved poplar and white aspen are synonyms defined as:

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

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

silver-leaved poplar (noun)	white aspen (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