Flint vs metropolis

Flint and metropolis both are nouns.

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

Flint (noun)	metropolis (noun)
a city in southeast central Michigan near Detroit; automobile manufacturing	people living in a large densely populated municipality
a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River	a large and densely populated urban area; may include several independent administrative districts