urban center vs Wichita Falls

urban center and Wichita Falls both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Wichita Falls	Yes	No	No	No

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