urban center vs Cambridge

urban center and Cambridge both are nouns.

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

urban center (noun)	Cambridge (noun)
a large and densely populated urban area; may include several independent administrative districts	a university in Cambridge, England
	a city in eastern England on the River Cam; site of Cambridge University
	a city in Massachusetts just to the north of Boston; site of Harvard University and the Massachusetts Institute of Technology