Antofagasta vs urban center

Antofagasta and urban center both are nouns.

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

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