metropolis vs Oaxaca City

metropolis and Oaxaca City both are nouns.

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

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