Populus heterophylla vs black cottonwood

Populus heterophylla and black cottonwood both are nouns.

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

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

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

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

Populus heterophylla (noun)	black cottonwood (noun)
North American poplar with large rounded scalloped leaves and brownish bark and wood	cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
	North American poplar with large rounded scalloped leaves and brownish bark and wood