cichlid vs percoidean

cichlid and percoidean both are nouns.

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

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

cichlid: freshwater fishes of tropical America and Africa and Asia similar to American sunfishes; some are food fishes; many small ones are popular in aquariums
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of cichlid include percoid, percoid fish.

cichlid (noun)	percoidean (noun)
freshwater fishes of tropical America and Africa and Asia similar to American sunfishes; some are food fishes; many small ones are popular in aquariums	any of numerous spiny-finned fishes of the order Perciformes