jawfish vs percoid fish

jawfish and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
jawfish	Yes	No	No	No
percoid fish	Yes	No	No	No

As nouns, percoid fish is a hypernym of jawfish; that is, percoid fish 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
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of jawfish include percoid, percoidean.

jawfish (noun)	percoid fish (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