combtooth blenny vs blennioid

combtooth blenny and blennioid both are nouns.

Word	Noun	Adjective	Verb	Adverb
combtooth blenny	Yes	No	No	No
blennioid	Yes	No	No	No

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

combtooth blenny: small usually scaleless fishes with comb-like teeth living about rocky shores; are territorial and live in holes between rocks
blennioid: elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins

Other hypernyms of combtooth blenny include blennioid fish.

combtooth blenny (noun)	blennioid (noun)
small usually scaleless fishes with comb-like teeth living about rocky shores; are territorial and live in holes between rocks	elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins