serranid fish vs serranid

serranid fish and serranid both are nouns.

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

As nouns, serranid fish and serranid are synonyms defined as:

serranid fish and serranid: marine food sport fishes mainly of warm coastal waters

serranid fish (noun)	serranid (noun)
marine food sport fishes mainly of warm coastal waters	marine food sport fishes mainly of warm coastal waters