crown-beard vs composite plant

crown-beard and composite plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
crown-beard	Yes	No	No	No
composite plant	Yes	No	No	No

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

crown-beard: any plant of the genus Verbesina having clustered white or yellow flower heads
composite plant: considered the most highly evolved dicotyledonous plants, characterized by florets arranged in dense heads that resemble single flowers

Other hypernyms of crown-beard include composite.

crown-beard (noun)	composite plant (noun)
any plant of the genus Verbesina having clustered white or yellow flower heads	considered the most highly evolved dicotyledonous plants, characterized by florets arranged in dense heads that resemble single flowers