northern dune tansy vs genus Tanacetum

northern dune tansy and genus Tanacetum both are nouns.

Word	Noun	Adjective	Verb	Adverb
northern dune tansy	Yes	No	No	No
genus Tanacetum	Yes	No	No	No

northern dune tansy (noun)	genus Tanacetum (noun)
lightly hairy rhizomatous perennial having aromatic feathery leaves and stems bearing open clusters of small buttonlike yellow flowers; sand dunes of Pacific coast of North America	a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum