barracouta vs food fish

barracouta and food fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
barracouta	Yes	No	No	No
food fish	Yes	No	No	No

As nouns, food fish is a hypernym of barracouta; that is, food fish is a word with a broader meaning than barracouta:

barracouta: a large marine food fish common on the coasts of Australia, New Zealand, and southern Africa
food fish: any fish used for food by human beings

barracouta (noun)	food fish (noun)
a large marine food fish common on the coasts of Australia, New Zealand, and southern Africa	any fish used for food by human beings