cardinalfish vs percoid

cardinalfish and percoid both are nouns.

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

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

Other hypernyms of cardinalfish include percoid fish, percoidean.

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