urban center vs Ann Arbor

urban center and Ann Arbor both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Ann Arbor	Yes	No	No	No

urban center (noun)	Ann Arbor (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern Michigan near Detroit; site of the University of Michigan