Wichita Falls vs metropolis

Wichita Falls and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Wichita Falls	Yes	No	No	No
metropolis	Yes	No	No	No

Wichita Falls (noun)	metropolis (noun)
a city in north central Texas near the Oklahoma border	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts