pikeblenny vs blennioid fish

pikeblenny and blennioid fish both are nouns.

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

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

pikeblenny: tropical American fishes; males are aggressively defensive of their territory
blennioid fish: elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins

Other hypernyms of pikeblenny include blennioid.

pikeblenny (noun)	blennioid fish (noun)
tropical American fishes; males are aggressively defensive of their territory	elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins