ague grass vs crow corn

ague grass and crow corn both are nouns.

Word	Noun	Adjective	Verb	Adverb
ague grass	Yes	No	No	No
crow corn	Yes	No	No	No

As nouns, crow corn is a hypernym of ague grass; that is, crow corn is a word with a broader meaning than ague grass:

ague grass: colicroot having a scurfy or granuliferous perianth and white flowers; southeastern United States
crow corn: any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic

Other hypernyms of ague grass include colic root, colicroot, star grass, unicorn root.

ague grass (noun)	crow corn (noun)
colicroot having a scurfy or granuliferous perianth and white flowers; southeastern United States	any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic