Pomatomus saltatrix vs percoid

Pomatomus saltatrix and percoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pomatomus saltatrix	Yes	No	No	No
percoid	Yes	No	No	No

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

Pomatomus saltatrix: bluish warm-water marine food and game fish that follow schools of small fishes into shallow waters
percoid: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of Pomatomus saltatrix include percoid fish, percoidean.

Pomatomus saltatrix (noun)	percoid (noun)
bluish warm-water marine food and game fish that follow schools of small fishes into shallow waters	any of numerous spiny-finned fishes of the order Perciformes