threadleaf groundsel vs genus Senecio

threadleaf groundsel and genus Senecio both are nouns.

Word	Noun	Adjective	Verb	Adverb
threadleaf groundsel	Yes	No	No	No
genus Senecio	Yes	No	No	No

threadleaf groundsel (noun)	genus Senecio (noun)
bluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower heads; southwestern United States; toxic to range livestock	enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds