sport fish vs fish

sport fish and fish both are nouns.

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

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

sport fish: any fish providing sport for the angler
fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

sport fish (noun)	fish (noun)
any fish providing sport for the angler	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

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