metropolis vs South Bend

metropolis and South Bend both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
South Bend	Yes	No	No	No

metropolis (noun)	South Bend (noun)
people living in a large densely populated municipality	a city in northern Indiana
a large and densely populated urban area; may include several independent administrative districts