butter daisy vs crown-beard

butter daisy and crown-beard both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter daisy	Yes	No	No	No
crown-beard	Yes	No	No	No

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

butter 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 butter daisy include crown beard, crownbeard.

butter 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