urban center vs Puebla

urban center and Puebla both are nouns.

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

urban center (noun)	Puebla (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in south central Mexico (southeast of Mexico City) on the edge of central Mexican plateau