metropolis vs Nova Lisboa

metropolis and Nova Lisboa both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Nova Lisboa	Yes	No	No	No

metropolis (noun)	Nova Lisboa (noun)
people living in a large densely populated municipality	a city in the mountains in western Angola
a large and densely populated urban area; may include several independent administrative districts