Babylonian weeping willow vs genus Salix

Babylonian weeping willow and genus Salix both are nouns.

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

Babylonian weeping willow (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