urban center vs Sao Goncalo

urban center and Sao Goncalo both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Sao Goncalo	Yes	No	No	No

urban center (noun)	Sao Goncalo (noun)
a large and densely populated urban area; may include several independent administrative districts	an industrial city in southeastern Brazil across the bay from Rio de Janeiro