Durango City vs metropolis

Durango City and metropolis both are nouns.

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

Durango City (noun)	metropolis (noun)
a city in north central Mexico; mining center	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts