Salix vs genus Salix

Salix and genus Salix both are nouns.

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

As nouns, Salix and genus Salix are synonyms defined as:

Salix and genus Salix: a large and widespread genus varying in size from small shrubs to large trees: willows

Salix (noun)	genus Salix (noun)
a large and widespread genus varying in size from small shrubs to large trees: willows	a large and widespread genus varying in size from small shrubs to large trees: willows