Puebla City vs metropolis

Puebla City and metropolis both are nouns.

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

Puebla City (noun)	metropolis (noun)
a city in south central Mexico (southeast of Mexico City) on the edge of central Mexican plateau	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts