king mackerel vs cero

king mackerel and cero both are nouns.

Word	Noun	Adjective	Verb	Adverb
king mackerel	Yes	No	No	No
cero	Yes	No	No	No

As nouns, king mackerel and cero are synonyms defined as:

king mackerel and cero: large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil

Other synonyms of king mackerel include cavalla, Scomberomorus cavalla.

king mackerel (noun)	cero (noun)
large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil	large edible mackerel of temperate United States coastal Atlantic waters
	large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil