golden ironweed vs crownbeard

golden ironweed and crownbeard both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden ironweed	Yes	No	No	No
crownbeard	Yes	No	No	No

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

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

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

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