Campeche City vs metropolis

Campeche City and metropolis both are nouns.

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

Campeche City (noun)	metropolis (noun)
a Mexican city on the Bay of Campeche	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts