cornetfish vs teleostan

cornetfish and teleostan both are nouns.

Word	Noun	Adjective	Verb	Adverb
cornetfish	Yes	No	No	No
teleostan	Yes	No	No	No

As nouns, teleostan is a hypernym of cornetfish; that is, teleostan is a word with a broader meaning than cornetfish:

cornetfish: slender tropical fish with a long tubular snout and bony plates instead of scales
teleostan: a bony fish of the subclass Teleostei

Other hypernyms of cornetfish include teleost, teleost fish.

cornetfish (noun)	teleostan (noun)
slender tropical fish with a long tubular snout and bony plates instead of scales	a bony fish of the subclass Teleostei