surgeonfish vs percoid fish

surgeonfish and percoid fish both are nouns.

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

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

surgeonfish: brightly colored coral-reef fish with knifelike spines at the tail
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of surgeonfish include percoid, percoidean.

surgeonfish (noun)	percoid fish (noun)
brightly colored coral-reef fish with knifelike spines at the tail	any of numerous spiny-finned fishes of the order Perciformes