Rachycentron canadum vs percoid

Rachycentron canadum and percoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rachycentron canadum	Yes	No	No	No
percoid	Yes	No	No	No

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

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

Other hypernyms of Rachycentron canadum include percoid fish, percoidean.

Rachycentron canadum (noun)	percoid (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