bluefin tuna vs bluefin

bluefin tuna and bluefin both are nouns.

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

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

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

Other synonyms of bluefin tuna include horse mackerel, Thunnus thynnus.

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

bluefin tuna (noun)	bluefin (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