ague grass vs unicorn root

ague grass and unicorn root both are nouns.

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

As nouns, unicorn root is a hypernym of ague grass; that is, unicorn 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
unicorn 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 colic root, colicroot, crow corn, star grass.

ague grass (noun)	unicorn 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