cacao vs cocoa bean

cacao and cocoa bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
cacao	Yes	No	No	No
cocoa bean	Yes	No	No	No

As nouns, cocoa bean is a hyponym of cacao; that is, cocoa bean is a word with a more specific, narrower meaning than cacao:

cacao: tropical American tree producing cacao beans
cocoa bean: seed of the cacao tree; ground roasted beans are source of chocolate

Other hyponyms of cacao include cacao bean.

cacao (noun)	cocoa bean (noun)
tropical American tree producing cacao beans	seed of the cacao tree; ground roasted beans are source of chocolate