metropolis vs Rosario

metropolis and Rosario both are nouns.

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

metropolis (noun)	Rosario (noun)
people living in a large densely populated municipality	a port city on the Parana River in eastern central Argentina
a large and densely populated urban area; may include several independent administrative districts