serranid fish vs percoid

serranid fish and percoid both are nouns.

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

As nouns, percoid is a hypernym of serranid fish; that is, percoid is a word with a broader meaning than serranid fish:

Other hypernyms of serranid fish include percoid fish, percoidean.

serranid fish (noun)	percoid (noun)
marine food sport fishes mainly of warm coastal waters	any of numerous spiny-finned fishes of the order Perciformes