goby vs percoidean

goby and percoidean both are nouns.

Word	Noun	Adjective	Verb	Adverb
goby	Yes	No	No	No
percoidean	Yes	No	No	No

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

goby: small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of goby include percoid, percoid fish.

goby (noun)	percoidean (noun)
small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker	any of numerous spiny-finned fishes of the order Perciformes