genus Salix vs Babylonian weeping willow

genus Salix and Babylonian weeping willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Salix	Yes	No	No	No
Babylonian weeping willow	Yes	No	No	No

genus Salix (noun)	Babylonian weeping willow (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