sand lance vs acanthopterygian

sand lance and acanthopterygian both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand lance	Yes	No	No	No
acanthopterygian	Yes	No	No	No

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

sand lance: very small silvery eellike schooling fishes that burrow into sandy beaches
acanthopterygian: a teleost fish with fins that are supported by sharp inflexible rays

Other hypernyms of sand lance include spiny-finned fish.

sand lance (noun)	acanthopterygian (noun)
very small silvery eellike schooling fishes that burrow into sandy beaches	a teleost fish with fins that are supported by sharp inflexible rays