genus Salix vs Wisconsin weeping willow

genus Salix and Wisconsin weeping willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Salix	Yes	No	No	No
Wisconsin weeping willow	Yes	No	No	No

genus Salix (noun)	Wisconsin weeping willow (noun)
a large and widespread genus varying in size from small shrubs to large trees: willows	hybrid willow usually not strongly weeping in habit