cardinalfish vs percoidean

cardinalfish and percoidean both are nouns.

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

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

Other hypernyms of cardinalfish include percoid, percoid fish.

cardinalfish (noun)	percoidean (noun)
small red fishes of coral reefs and inshore tropical waters	any of numerous spiny-finned fishes of the order Perciformes