Salix amygdaloides vs genus Salix

Salix amygdaloides and genus Salix both are nouns.

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

Salix amygdaloides (noun)	genus Salix (noun)
willow of the western United States with leaves like those of peach or almond trees	a large and widespread genus varying in size from small shrubs to large trees: willows