Salix alba sericea vs genus Salix

Salix alba sericea and genus Salix both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix alba sericea	Yes	No	No	No
genus Salix	Yes	No	No	No

Salix alba sericea (noun)	genus Salix (noun)
North American willow with greyish silky pubescent leaves that usually blacken in drying	a large and widespread genus varying in size from small shrubs to large trees: willows