metropolis vs Newcastle

metropolis and Newcastle both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Newcastle	Yes	No	No	No

metropolis (noun)	Newcastle (noun)
people living in a large densely populated municipality	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)
a large and densely populated urban area; may include several independent administrative districts