Oxford vs city

Oxford and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oxford	Yes	No	No	No
city	Yes	No	No	No

Oxford (noun)	city (noun)
a university in Oxford, England	people living in a large densely populated municipality
a city in southern England to the northwest of London; site of Oxford University	a large and densely populated urban area; may include several independent administrative districts
a university town in northern Mississippi; home of William Faulkner	an incorporated administrative district established by state charter