urban center vs Luxor

urban center and Luxor both are nouns.

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

urban center (noun)	Luxor (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in central Egypt on the east bank of the Nile that is a center for visitors to the ruins of and around Thebes