Grand Rapids vs metropolis

Grand Rapids and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Grand Rapids	Yes	No	No	No
metropolis	Yes	No	No	No

Grand Rapids (noun)	metropolis (noun)
a city in west central Michigan; noted for manufacturing furniture	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts