Zaragoza vs metropolis

Zaragoza and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zaragoza	Yes	No	No	No
metropolis	Yes	No	No	No

Zaragoza (noun)	metropolis (noun)
an ancient city on the Ebro River in northeastern Spain; formerly the capital of Aragon	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts