wrymouth vs blennioid fish

wrymouth and blennioid fish both are nouns.

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

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

wrymouth: eellike Atlantic bottom fish with large almost vertical mouth
blennioid fish: elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins

Other hypernyms of wrymouth include blennioid.

wrymouth (noun)	blennioid fish (noun)
eellike Atlantic bottom fish with large almost vertical mouth	elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins