genus Salix vs Salix amygdalina

genus Salix and Salix amygdalina both are nouns.

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

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