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