genus Tanacetum vs pyrethrum

genus Tanacetum and pyrethrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Tanacetum	Yes	No	No	No
pyrethrum	Yes	No	No	No

genus Tanacetum (noun)	pyrethrum (noun)
a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum	spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum
	white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
	made of dried flower heads of pyrethrum plants