urban center vs Dallas

urban center and Dallas both are nouns.

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

urban center (noun)	Dallas (noun)
a large and densely populated urban area; may include several independent administrative districts	a large commercial and industrial city in northeastern Texas located in the heart of the northern Texas oil fields