Populus heterophylla vs swamp cottonwood

Populus heterophylla and swamp cottonwood both are nouns.

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

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

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

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

Populus heterophylla (noun)	swamp cottonwood (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