Colorado Springs vs metropolis

Colorado Springs and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Colorado Springs	Yes	No	No	No
metropolis	Yes	No	No	No

Colorado Springs (noun)	metropolis (noun)
a city in east central Colorado on the eastern edge of the Rocky Mountains; popular tourist center and site of the United States Air Force Academy	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts