downy poplar vs swamp poplar

downy poplar and swamp poplar both are nouns.

Word	Noun	Adjective	Verb	Adverb
downy poplar	Yes	No	No	No
swamp poplar	Yes	No	No	No

As nouns, downy poplar and swamp poplar are synonyms defined as:

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

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

downy poplar (noun)	swamp poplar (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