black cottonwood vs Populus trichocarpa

black cottonwood and Populus trichocarpa both are nouns.

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

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

black cottonwood and Populus trichocarpa: cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath

Other synonyms of black cottonwood include Western balsam poplar.

black cottonwood (noun)	Populus trichocarpa (noun)
cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath	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