cartilaginous fish vs fish

cartilaginous fish and fish both are nouns.

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

As nouns, fish is a hypernym of cartilaginous fish; that is, fish is a word with a broader meaning than cartilaginous fish:

cartilaginous fish: fishes in which the skeleton may be calcified but not ossified
fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

cartilaginous fish (noun)	fish (noun)
fishes in which the skeleton may be calcified but not ossified	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

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