teleost vs flying fish

teleost and flying fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
teleost	Yes	No	No	No
flying fish	Yes	No	No	No

As nouns, flying fish is a hyponym of teleost; that is, flying fish is a word with a more specific, narrower meaning than teleost:

teleost: a bony fish of the subclass Teleostei
flying fish: tropical marine fishes having enlarged winglike fins used for brief gliding flight

teleost (noun)	flying fish (noun)
a bony fish of the subclass Teleostei	tropical marine fishes having enlarged winglike fins used for brief gliding flight