damselfish vs percoid

damselfish and percoid both are nouns.

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

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

Other hypernyms of damselfish include percoid fish, percoidean.

damselfish (noun)	percoid (noun)
small brilliantly colored tropical marine fishes of coral reefs	any of numerous spiny-finned fishes of the order Perciformes