metropolis vs Greater Sudbury

metropolis and Greater Sudbury both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Greater Sudbury	Yes	No	No	No

metropolis (noun)	Greater Sudbury (noun)
people living in a large densely populated municipality	a city in south central Canada in Ontario; a major nickel mining center
a large and densely populated urban area; may include several independent administrative districts