urban center vs Antofagasta

urban center and Antofagasta both are nouns.

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

urban center (noun)	Antofagasta (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city on the Pacific in northern Chile