metropolis vs Grand Rapids

metropolis and Grand Rapids both are nouns.

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

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