urban center vs Assuan

urban center and Assuan both are nouns.

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

urban center (noun)	Assuan (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city on the Nile in Egypt; two dams across the Nile have been built nearby