urban center vs Plano

urban center and Plano both are nouns.

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

urban center (noun)	Plano (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in northeastern Texas (suburb of Dallas) with counties Collin and Denton