sand stargazer vs percoidean

sand stargazer and percoidean both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand stargazer	Yes	No	No	No
percoidean	Yes	No	No	No

As nouns, percoidean is a hypernym of sand stargazer; that is, percoidean is a word with a broader meaning than sand stargazer:

sand stargazer: small pallid fishes of shoal tropical waters of North America and South America having eyes on stalks atop head; they burrow in sand to await prey
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sand stargazer include percoid, percoid fish.

sand stargazer (noun)	percoidean (noun)
small pallid fishes of shoal tropical waters of North America and South America having eyes on stalks atop head; they burrow in sand to await prey	any of numerous spiny-finned fishes of the order Perciformes