urban center vs Newcastle

urban center and Newcastle both are nouns.

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

urban center (noun)	Newcastle (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)