wingstem vs crown beard

wingstem and crown beard both are nouns.

Word	Noun	Adjective	Verb	Adverb
wingstem	Yes	No	No	No
crown beard	Yes	No	No	No

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

wingstem: 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 wingstem include crown-beard, crownbeard.

wingstem (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