horse mackerel vs Trachurus symmetricus

horse mackerel and Trachurus symmetricus both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse mackerel	Yes	No	No	No
Trachurus symmetricus	Yes	No	No	No

As nouns, horse mackerel and Trachurus symmetricus are synonyms defined as:

Other synonyms of horse mackerel include jack mackerel, saurel, Spanish mackerel.

horse mackerel (noun)	Trachurus symmetricus (noun)
a California food fish	a California food fish
large elongated compressed food fish of the Atlantic waters of Europe
largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics