sciaenid fish vs sciaenid

sciaenid fish and sciaenid both are nouns.

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

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

sciaenid fish and sciaenid: widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound

sciaenid fish (noun)	sciaenid (noun)
widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound	widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound