Ciudad Juarez vs urban center

Ciudad Juarez and urban center both are nouns.

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

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