archerfish vs percoid

archerfish and percoid both are nouns.

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

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

archerfish: any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia
percoid: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of archerfish include percoid fish, percoidean.

archerfish (noun)	percoid (noun)
any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia	any of numerous spiny-finned fishes of the order Perciformes