monkfish vs spiny-finned fish

monkfish and spiny-finned fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
monkfish	Yes	No	No	No
spiny-finned fish	Yes	No	No	No

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

monkfish: fishes having large mouths with a wormlike filament attached for luring prey
spiny-finned fish: a teleost fish with fins that are supported by sharp inflexible rays

Other hypernyms of monkfish include acanthopterygian.

monkfish (noun)	spiny-finned fish (noun)
fishes having large mouths with a wormlike filament attached for luring prey	a teleost fish with fins that are supported by sharp inflexible rays
sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do
flesh of a large-headed anglerfish of the Atlantic waters of North America