cowpen daisy vs crownbeard

cowpen daisy and crownbeard both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpen daisy	Yes	No	No	No
crownbeard	Yes	No	No	No

As nouns, crownbeard is a hypernym of cowpen daisy; that is, crownbeard is a word with a broader meaning than cowpen daisy:

cowpen daisy: coarse greyish-green annual yellow-flowered herb; southwestern United States to Mexico
crownbeard: any plant of the genus Verbesina having clustered white or yellow flower heads

Other hypernyms of cowpen daisy include crown-beard, crown beard.

cowpen daisy (noun)	crownbeard (noun)
coarse greyish-green annual yellow-flowered herb; southwestern United States to Mexico	any plant of the genus Verbesina having clustered white or yellow flower heads