golden ironweed vs crown beard

golden ironweed and crown beard both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden ironweed	Yes	No	No	No
crown beard	Yes	No	No	No

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

golden ironweed: perennial herb with showy yellow flowers; the eastern United States
crown beard: any plant of the genus Verbesina having clustered white or yellow flower heads

Other hypernyms of golden ironweed include crown-beard, crownbeard.

golden ironweed (noun)	crown beard (noun)
perennial herb with showy yellow flowers; the eastern United States	any plant of the genus Verbesina having clustered white or yellow flower heads