cornetfish vs teleost

cornetfish and teleost both are nouns.

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

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

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

Other hypernyms of cornetfish include teleost fish, teleostan.

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