bluefin vs Thunnus thynnus

bluefin and Thunnus thynnus both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluefin	Yes	No	No	No
Thunnus thynnus	Yes	No	No	No

As nouns, bluefin and Thunnus thynnus are synonyms defined as:

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

Other synonyms of bluefin include bluefin tuna, horse mackerel.

bluefin (noun)	Thunnus thynnus (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