sea bass vs serranid fish

sea bass and serranid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea bass	Yes	No	No	No
serranid fish	Yes	No	No	No

As nouns, serranid fish is a hypernym of sea bass; that is, serranid fish is a word with a broader meaning than sea bass:

sea bass: any of various food and sport fishes of the Atlantic coast of the United States having an elongated body and long spiny dorsal fin
serranid fish: marine food sport fishes mainly of warm coastal waters

Other hypernyms of sea bass include food fish, serranid.

sea bass (noun)	serranid fish (noun)
any of various food and sport fishes of the Atlantic coast of the United States having an elongated body and long spiny dorsal fin	marine food sport fishes mainly of warm coastal waters
the lean flesh of a saltwater fish of the family Serranidae