cocoa bean vs cacao

cocoa bean and cacao both are nouns.

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

As nouns, cacao is a hypernym of cocoa bean; that is, cacao is a word with a broader meaning than cocoa bean:

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

Other hypernyms of cocoa bean include cacao tree, chocolate tree, Theobroma cacao.

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