Rosario vs urban center

Rosario and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rosario	Yes	No	No	No
urban center	Yes	No	No	No

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