urban center vs Alexandria

urban center and Alexandria both are nouns.

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

urban center (noun)	Alexandria (noun)
a large and densely populated urban area; may include several independent administrative districts	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 town in Louisiana on the Red River