Populus vs genus Populus

Populus and genus Populus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Populus	Yes	No	No	No
genus Populus	Yes	No	No	No

As nouns, Populus and genus Populus are synonyms defined as:

Populus and genus Populus: a genus of trees of the family Salicaceae that is found in the Northern Hemisphere; poplars

Populus (noun)	genus Populus (noun)
a genus of trees of the family Salicaceae that is found in the Northern Hemisphere; poplars	a genus of trees of the family Salicaceae that is found in the Northern Hemisphere; poplars