sergeant fish vs percoid fish

sergeant fish and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sergeant fish	Yes	No	No	No
percoid fish	Yes	No	No	No

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

sergeant fish: large dark-striped tropical food and game fish related to remoras; found worldwide in coastal to open waters
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sergeant fish include percoid, percoidean.

sergeant fish (noun)	percoid fish (noun)
large dark-striped tropical food and game fish related to remoras; found worldwide in coastal to open waters	any of numerous spiny-finned fishes of the order Perciformes