ague grass vs colic root

ague grass and colic root both are nouns.

Word	Noun	Adjective	Verb	Adverb
ague grass	Yes	No	No	No
colic root	Yes	No	No	No

As nouns, colic root is a hypernym of ague grass; that is, colic root 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
colic root: any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic

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

ague grass (noun)	colic root (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