alewife vs clupeid

alewife and clupeid both are nouns.

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

As nouns, clupeid is a hypernym of alewife; that is, clupeid 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: any of numerous soft-finned schooling food fishes of shallow waters of northern seas

Other hypernyms of alewife include clupeid fish.

alewife (noun)	clupeid (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