Spanish mackerel vs horse mackerel

Spanish mackerel and horse mackerel both are nouns.

Word	Noun	Adjective	Verb	Adverb
Spanish mackerel	Yes	No	No	No
horse mackerel	Yes	No	No	No

As nouns, Spanish mackerel and horse mackerel are synonyms defined as:

Other synonyms of Spanish mackerel include jack mackerel, saurel, Trachurus symmetricus.

Spanish mackerel (noun)	horse mackerel (noun)
any of several large marine food fishes of the genus Scomberomorus	a California food fish
medium-sized mackerel of temperate Atlantic and Gulf of Mexico	large elongated compressed food fish of the Atlantic waters of Europe
a California food fish	largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
flesh of commercially important fishes especially of the Atlantic coastal waters of America