cocoa plum vs edible fruit

cocoa plum and edible fruit both are nouns.

Word	Noun	Adjective	Verb	Adverb
cocoa plum	Yes	No	No	No
edible fruit	Yes	No	No	No

As nouns, edible fruit is a hypernym of cocoa plum; that is, edible fruit is a word with a broader meaning than cocoa plum:

cocoa plum: plum-shaped whitish to almost black fruit used for preserves; tropical American
edible fruit: edible reproductive body of a seed plant especially one having sweet flesh

cocoa plum (noun)	edible fruit (noun)
plum-shaped whitish to almost black fruit used for preserves; tropical American	edible reproductive body of a seed plant especially one having sweet flesh
small tropical American tree bearing edible plumlike fruit