gentian vs agueweed

gentian and agueweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
gentian	Yes	No	No	No
agueweed	Yes	No	No	No

As nouns, agueweed is a hyponym of gentian; that is, agueweed is a word with a more specific, narrower meaning than gentian:

gentian: any of various plants of the family Gentianaceae especially the genera Gentiana and Gentianella and Gentianopsis
agueweed: gentian of eastern North America having clusters of bristly blue flowers

gentian (noun)	agueweed (noun)
any of various plants of the family Gentianaceae especially the genera Gentiana and Gentianella and Gentianopsis	gentian of eastern North America having clusters of bristly blue flowers
	perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine