genus Salix vs Salix babylonica

genus Salix and Salix babylonica both are nouns.

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

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