shad vs food fish

shad and food fish both are nouns.

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

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

shad: herring-like food fishes that migrate from the sea to fresh water to spawn
food fish: any fish used for food by human beings

Other hypernyms of shad include clupeid, clupeid fish.

shad (noun)	food fish (noun)
herring-like food fishes that migrate from the sea to fresh water to spawn	any fish used for food by human beings
bony flesh of herring-like fish usually caught during their migration to fresh water for spawning; especially of Atlantic coast