urban center vs Ciudad Juarez

urban center and Ciudad Juarez both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Ciudad Juarez	Yes	No	No	No

urban center (noun)	Ciudad Juarez (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in northern Mexico on the Rio Grande opposite El Paso