white aspen vs aspen poplar

white aspen and aspen poplar both are nouns.

Word	Noun	Adjective	Verb	Adverb
white aspen	Yes	No	No	No
aspen poplar	Yes	No	No	No

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

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

white aspen (noun)	aspen 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