Oxford vs urban center

Oxford and urban center both are nouns.

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

Oxford (noun)	urban center (noun)
a university in Oxford, England	a large and densely populated urban area; may include several independent administrative districts
a city in southern England to the northwest of London; site of Oxford University
a university town in northern Mississippi; home of William Faulkner