alewife vs clupeid fish

alewife and clupeid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
alewife	Yes	No	No	No
clupeid fish	Yes	No	No	No

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

alewife: shad-like food fish that runs rivers to spawn; often salted or smoked; sometimes placed in genus Pomolobus
clupeid fish: any of numerous soft-finned schooling food fishes of shallow waters of northern seas

Other hypernyms of alewife include clupeid.

alewife (noun)	clupeid fish (noun)
shad-like food fish that runs rivers to spawn; often salted or smoked; sometimes placed in genus Pomolobus	any of numerous soft-finned schooling food fishes of shallow waters of northern seas
flesh of shad-like fish abundant along the Atlantic coast or in coastal streams