sand launce vs acanthopterygian

sand launce and acanthopterygian both are nouns.

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

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

sand launce: 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 launce include spiny-finned fish.

sand launce (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