genus Salix vs creeping willow

genus Salix and creeping willow both are nouns.

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

genus Salix (noun)	creeping willow (noun)
a large and widespread genus varying in size from small shrubs to large trees: willows	small trailing bush of Europe and Asia having straggling branches with silky green leaves of which several varieties are cultivated