crow corn vs ague grass

crow corn and ague grass both are nouns.

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

As nouns, ague grass is a hyponym of crow corn; that is, ague grass is a word with a more specific, narrower meaning than crow corn:

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

Other hyponyms of crow corn include ague root, Aletris farinosa, Aletris aurea, yellow colicroot.

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