metropolis vs Vicente Lopez

metropolis and Vicente Lopez both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Vicente Lopez	Yes	No	No	No

metropolis (noun)	Vicente Lopez (noun)
people living in a large densely populated municipality	an industrial suburb of Buenos Aires
a large and densely populated urban area; may include several independent administrative districts