metropolis vs Ciudad Bolivar

metropolis and Ciudad Bolivar both are nouns.

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

metropolis (noun)	Ciudad Bolivar (noun)
people living in a large densely populated municipality	a port in eastern Venezuela on the Orinoco river
a large and densely populated urban area; may include several independent administrative districts