Salix amygdalina vs genus Salix

Salix amygdalina and genus Salix both are nouns.

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

Salix amygdalina (noun)	genus Salix (noun)
Old World willow with light green leaves cultivated for use in basketry	a large and widespread genus varying in size from small shrubs to large trees: willows