Wisconsin weeping willow vs genus Salix

Wisconsin weeping willow and genus Salix both are nouns.

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

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