Ciudad Victoria vs metropolis

Ciudad Victoria and metropolis both are nouns.

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

Ciudad Victoria (noun)	metropolis (noun)
a city in east central Mexico	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts