crownbeard vs composite plant

crownbeard and composite plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
crownbeard	Yes	No	No	No
composite plant	Yes	No	No	No

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

crownbeard: 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 crownbeard include composite.

crownbeard (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