Sioux Falls vs urban center

Sioux Falls and urban center both are nouns.

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

Sioux Falls (noun)	urban center (noun)
largest city in South Dakota; located in southeastern South Dakota	a large and densely populated urban area; may include several independent administrative districts