sleeper goby vs percoid fish

sleeper goby and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleeper goby	Yes	No	No	No
percoid fish	Yes	No	No	No

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

sleeper goby: tropical fish that resembles a goby and rests quietly on the bottom in shallow water
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sleeper goby include percoid, percoidean.

sleeper goby (noun)	percoid fish (noun)
tropical fish that resembles a goby and rests quietly on the bottom in shallow water	any of numerous spiny-finned fishes of the order Perciformes