Salix babylonica vs genus Salix

Salix babylonica and genus Salix both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix babylonica	Yes	No	No	No
genus Salix	Yes	No	No	No

Salix babylonica (noun)	genus Salix (noun)
willow with long drooping branches and slender leaves native to China; widely cultivated as an ornamental	a large and widespread genus varying in size from small shrubs to large trees: willows