genus Salix vs bearberry willow

genus Salix and bearberry willow both are nouns.

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

genus Salix (noun)	bearberry willow (noun)
a large and widespread genus varying in size from small shrubs to large trees: willows	dwarf prostrate mat-forming shrub of Arctic and alpine regions of North America and Greenland having deep green elliptic leaves that taper toward the base