Newcastle upon Tyne vs city

Newcastle upon Tyne and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Newcastle upon Tyne	Yes	No	No	No
city	Yes	No	No	No

Newcastle upon Tyne (noun)	city (noun)
a port city in northeastern England on the River Tyne; a center for coal exports (giving rise to the expression `carry coals to Newcastle' meaning to do something unnecessary)	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter