horse mackerel vs Spanish mackerel

horse mackerel and Spanish mackerel both are nouns.

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

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

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

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