white aspen vs silver-leaved poplar

white aspen and silver-leaved poplar both are nouns.

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

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

white aspen and silver-leaved poplar: 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, Populus alba, white poplar.

white aspen (noun)	silver-leaved 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