cocoa bean vs chocolate tree

cocoa bean and chocolate tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
cocoa bean	Yes	No	No	No
chocolate tree	Yes	No	No	No

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

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

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

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