urban center vs Ur

urban center and Ur both are nouns.

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

urban center (noun)	Ur (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city of Sumer located on a former channel of the Euphrates River