Bahia Blanca vs metropolis

Bahia Blanca and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bahia Blanca	Yes	No	No	No
metropolis	Yes	No	No	No

Bahia Blanca (noun)	metropolis (noun)
a port city in eastern Argentina to the southwest of Buenos Aires on an inlet of the Atlantic Ocean	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts