dusty miller vs genus Tanacetum

dusty miller and genus Tanacetum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dusty miller	Yes	No	No	No
genus Tanacetum	Yes	No	No	No

dusty miller (noun)	genus Tanacetum (noun)
herb with greyish leaves found along the east coast of North America; used as an ornamental plant	a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum
shrubby perennial of the Canary Islands having white flowers and leaves and hairy stems covered with dustlike down; sometimes placed in genus Chrysanthemum
stiff much-branched perennial of the Mediterranean region having very white woolly stems and leaves
a plant having leaves and stems covered with down that resembles dust
an old cottage garden plant of southeastern Europe widely cultivated for its attractive white woolly foliage and showy crimson flowers