Milan vs urban center

Milan and urban center both are nouns.

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

Milan (noun)	urban center (noun)
the capital of Lombardy in northern Italy; has been an international center of trade and industry since the Middle Ages	a large and densely populated urban area; may include several independent administrative districts