Populus heterophylla vs swamp poplar

Populus heterophylla and swamp poplar both are nouns.

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

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

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

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

Populus heterophylla (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