batfish vs acanthopterygian

batfish and acanthopterygian both are nouns.

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

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

batfish: bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins
acanthopterygian: a teleost fish with fins that are supported by sharp inflexible rays

Other hypernyms of batfish include spiny-finned fish.

batfish (noun)	acanthopterygian (noun)
bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins	a teleost fish with fins that are supported by sharp inflexible rays