rattail fish vs grenadier

rattail fish and grenadier both are nouns.

Word	Noun	Adjective	Verb	Adverb
rattail fish	Yes	No	No	No
grenadier	Yes	No	No	No

As nouns, rattail fish and grenadier are synonyms defined as:

rattail fish and grenadier: deep-sea fish with a large head and body and long tapering tail

Other synonyms of rattail fish include rattail.

rattail fish (noun)	grenadier (noun)
deep-sea fish with a large head and body and long tapering tail	deep-sea fish with a large head and body and long tapering tail
	an infantryman equipped with grenades