metropolis vs Ciudad Juarez

metropolis and Ciudad Juarez both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Ciudad Juarez	Yes	No	No	No

metropolis (noun)	Ciudad Juarez (noun)
people living in a large densely populated municipality	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