urban center vs Persepolis

urban center and Persepolis both are nouns.

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

urban center (noun)	Persepolis (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city that was the capital of the ancient Persian Empire; now in ruins