urban center vs Bahia Blanca

urban center and Bahia Blanca both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Bahia Blanca	Yes	No	No	No

urban center (noun)	Bahia Blanca (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city in eastern Argentina to the southwest of Buenos Aires on an inlet of the Atlantic Ocean