urban center vs Arequipa

urban center and Arequipa both are nouns.

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

urban center (noun)	Arequipa (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern Peru founded in 1540 on the site of an ancient Inca city