fish vs bony fish

fish and bony fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
fish	Yes	No	Yes	No
bony fish	Yes	No	No	No

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

fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
bony fish: any fish of the class Osteichthyes

fish (noun)	bony fish (noun)
any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills	any fish of the class Osteichthyes
the flesh of fish used as food

fish (verb)	bony fish (verb)
catch or try to catch fish or shellfish
seek indirectly