bluefin vs bluefin tuna

bluefin and bluefin tuna both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluefin	Yes	No	No	No
bluefin tuna	Yes	No	No	No

As nouns, bluefin and bluefin tuna are synonyms defined as:

bluefin and bluefin tuna: largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics

Other synonyms of bluefin include horse mackerel, Thunnus thynnus.

As nouns, bluefin and bluefin tuna are synonyms defined as:

bluefin (noun)	bluefin tuna (noun)
largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics	largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
flesh of very large tuna	flesh of very large tuna