Arequipa vs urban center

Arequipa and urban center both are nouns.

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

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