parrotfish vs percoidean

parrotfish and percoidean both are nouns.

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

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

parrotfish: gaudy tropical fishes with parrotlike beaks formed by fusion of teeth
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of parrotfish include percoid, percoid fish.

parrotfish (noun)	percoidean (noun)
gaudy tropical fishes with parrotlike beaks formed by fusion of teeth	any of numerous spiny-finned fishes of the order Perciformes