cowpen daisy vs crown beard

cowpen daisy and crown beard both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpen daisy	Yes	No	No	No
crown beard	Yes	No	No	No

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

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

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

cowpen daisy (noun)	crown beard (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