Oaxaca City vs metropolis

Oaxaca City and metropolis both are nouns.

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

Oaxaca City (noun)	metropolis (noun)
a city of southeastern Mexico	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts