clupeid fish vs malacopterygian

clupeid fish and malacopterygian both are nouns.

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

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

clupeid fish: any of numerous soft-finned schooling food fishes of shallow waters of northern seas
malacopterygian: any fish of the superorder Malacopterygii

Other hypernyms of clupeid fish include soft-finned fish.

clupeid fish (noun)	malacopterygian (noun)
any of numerous soft-finned schooling food fishes of shallow waters of northern seas	any fish of the superorder Malacopterygii