Campeche City vs Campeche

Campeche City and Campeche both are nouns.

Word	Noun	Adjective	Verb	Adverb
Campeche City	Yes	No	No	No
Campeche	Yes	No	No	No

As nouns, Campeche City and Campeche are synonyms defined as:

Campeche City (noun)	Campeche (noun)
a Mexican city on the Bay of Campeche	a Mexican city on the Bay of Campeche
	a Mexican state on the eastern part of the Gulf of Campeche