metropolis vs Stuttgart

metropolis and Stuttgart both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Stuttgart	Yes	No	No	No

metropolis (noun)	Stuttgart (noun)
people living in a large densely populated municipality	a city in southwestern Germany famous for innovative architecture
a large and densely populated urban area; may include several independent administrative districts