white aspen vs white poplar

white aspen and white poplar both are nouns.

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

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

white aspen and white 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, silver-leaved poplar.

white aspen (noun)	white 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
	light easily worked wood of a tulip tree; used for furniture and veneer