monkfish vs acanthopterygian

monkfish and acanthopterygian both are nouns.

Word	Noun	Adjective	Verb	Adverb
monkfish	Yes	No	No	No
acanthopterygian	Yes	No	No	No

As nouns, acanthopterygian is a hypernym of monkfish; that is, acanthopterygian is a word with a broader meaning than monkfish:

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

Other hypernyms of monkfish include spiny-finned fish.

monkfish (noun)	acanthopterygian (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