fingerling vs fish

fingerling and fish both are nouns.

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

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

fingerling: a young or small fish
fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

fingerling (noun)	fish (noun)
a young or small fish	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

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