urban center vs Assur

urban center and Assur both are nouns.

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

urban center (noun)	Assur (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient Assyrian city on the Tigris and traditional capital of Assyria; just to the south of the modern city of Mosul in Iraq