urban center vs Tulsa

urban center and Tulsa both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Tulsa	Yes	No	No	No

urban center (noun)	Tulsa (noun)
a large and densely populated urban area; may include several independent administrative districts	a major city of northeastern Oklahoma on the Arkansas river; once known as the oil capital of the world and still heavily involved in the oil and gas industries