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