urban center vs Newcastle-upon-Tyne

urban center and Newcastle-upon-Tyne both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Newcastle-upon-Tyne	Yes	No	No	No

urban center (noun)	Newcastle-upon-Tyne (noun)
a large and densely populated urban area; may include several independent administrative districts	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)