genus Salix vs Huntingdon willow

genus Salix and Huntingdon willow both are nouns.

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

genus Salix (noun)	Huntingdon willow (noun)
a large and widespread genus varying in size from small shrubs to large trees: willows	large willow tree of Eurasia and North Africa having greyish canescent leaves and grey bark