wolf fish vs blennioid

wolf fish and blennioid both are nouns.

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

As nouns, blennioid is a hypernym of wolf fish; that is, blennioid is a word with a broader meaning than wolf fish:

wolf fish: large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins
blennioid: elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins

Other hypernyms of wolf fish include blennioid fish.

wolf fish (noun)	blennioid (noun)
large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins	elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins