Alexandria vs urban center

Alexandria and urban center both are nouns.

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

Alexandria (noun)	urban center (noun)
the chief port of Egypt; located on the western edge of the Nile delta on the Mediterranean Sea; founded by Alexander the Great; the capital of ancient Egypt	a large and densely populated urban area; may include several independent administrative districts
a town in Louisiana on the Red River