suckerfish vs acanthopterygian

suckerfish and acanthopterygian both are nouns.

Word	Noun	Adjective	Verb	Adverb
suckerfish	Yes	No	No	No
acanthopterygian	Yes	No	No	No

As nouns, acanthopterygian is a hypernym of suckerfish; that is, acanthopterygian is a word with a broader meaning than suckerfish:

suckerfish: marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects
acanthopterygian: a teleost fish with fins that are supported by sharp inflexible rays

Other hypernyms of suckerfish include spiny-finned fish.

suckerfish (noun)	acanthopterygian (noun)
marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects	a teleost fish with fins that are supported by sharp inflexible rays