cobia vs percoid fish

cobia and percoid fish both are nouns.

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

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

cobia: 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 cobia include percoid, percoidean.

cobia (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