blennioid fish vs blennioid

blennioid fish and blennioid both are nouns.

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

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

blennioid fish and blennioid: elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins

blennioid fish (noun)	blennioid (noun)
elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins	elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins