Salix vitellina vs genus Salix

Salix vitellina and genus Salix both are nouns.

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

Salix vitellina (noun)	genus Salix (noun)
European willow having greyish leaves and yellow-orange twigs used in basketry	a large and widespread genus varying in size from small shrubs to large trees: willows