angelfish vs percoidean

angelfish and percoidean both are nouns.

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

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

angelfish: deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of angelfish include percoid, percoid fish.

angelfish (noun)	percoidean (noun)
sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do	any of numerous spiny-finned fishes of the order Perciformes
a butterfly fish of the genus Pomacanthus
deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters