clupeid vs soft-finned fish

clupeid and soft-finned fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
clupeid	Yes	No	No	No
soft-finned fish	Yes	No	No	No

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

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

Other hypernyms of clupeid include malacopterygian.

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