pyrethrum vs insect powder

pyrethrum and insect powder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyrethrum	Yes	No	No	No
insect powder	Yes	No	No	No

As nouns, insect powder is a hypernym of pyrethrum; that is, insect powder is a word with a broader meaning than pyrethrum:

Other hypernyms of pyrethrum include insecticide.

pyrethrum (noun)	insect powder (noun)
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	a chemical used to kill insects
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