horse mackerel vs Trachurus trachurus

horse mackerel and Trachurus trachurus both are nouns.

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

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

horse mackerel and Trachurus trachurus: large elongated compressed food fish of the Atlantic waters of Europe

Other synonyms of horse mackerel include saurel.

horse mackerel (noun)	Trachurus trachurus (noun)
a California food fish	large elongated compressed food fish of the Atlantic waters of Europe
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