anchovy vs soft-finned fish

anchovy and soft-finned fish both are nouns.

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

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

anchovy: small herring-like plankton-eating fishes often canned whole or as paste; abundant in tropical waters worldwide
soft-finned fish: any fish of the superorder Malacopterygii

Other hypernyms of anchovy include malacopterygian.

anchovy (noun)	soft-finned fish (noun)
small herring-like plankton-eating fishes often canned whole or as paste; abundant in tropical waters worldwide	any fish of the superorder Malacopterygii
tiny fishes usually canned or salted; used for hors d'oeuvres or as seasoning in sauces