downy poplar vs Populus heterophylla

downy poplar and Populus heterophylla both are nouns.

Word	Noun	Adjective	Verb	Adverb
downy poplar	Yes	No	No	No
Populus heterophylla	Yes	No	No	No

As nouns, downy poplar and Populus heterophylla are synonyms defined as:

downy poplar and Populus heterophylla: North American poplar with large rounded scalloped leaves and brownish bark and wood

Other synonyms of downy poplar include black cottonwood, swamp cottonwood, swamp poplar.

downy poplar (noun)	Populus heterophylla (noun)
North American poplar with large rounded scalloped leaves and brownish bark and wood	North American poplar with large rounded scalloped leaves and brownish bark and wood