tuna fish vs albacore

tuna fish and albacore both are nouns.

Word	Noun	Adjective	Verb	Adverb
tuna fish	Yes	No	No	No
albacore	Yes	No	No	No

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

tuna fish: important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks
albacore: relatively small tuna with choice white flesh; major source of canned tuna

Other hyponyms of tuna fish include bonito, bluefin, bluefin tuna.

tuna fish (noun)	albacore (noun)
important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks	large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters
	relatively small tuna with choice white flesh; major source of canned tuna