Ciudad Bolivar vs metropolis

Ciudad Bolivar and metropolis both are nouns.

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

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