Gulf of Mexico vs Gulf of Campeche

Gulf of Mexico and Gulf of Campeche both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gulf of Mexico	Yes	No	No	No
Gulf of Campeche	Yes	No	No	No

Gulf of Mexico (noun)	Gulf of Campeche (noun)
an arm of the Atlantic to the south of the United States and to the east of Mexico	a part of the Gulf of Mexico to the west of Yucatan