jawfish vs percoidean

jawfish and percoidean both are nouns.

Word	Noun	Adjective	Verb	Adverb
jawfish	Yes	No	No	No
percoidean	Yes	No	No	No

As nouns, percoidean is a hypernym of jawfish; that is, percoidean is a word with a broader meaning than jawfish:

jawfish: small large-mouthed tropical marine fishes common along sandy bottoms; males brood egg balls in their mouths; popular aquarium fishes
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of jawfish include percoid, percoid fish.

jawfish (noun)	percoidean (noun)
small large-mouthed tropical marine fishes common along sandy bottoms; males brood egg balls in their mouths; popular aquarium fishes	any of numerous spiny-finned fishes of the order Perciformes