Greater Sudbury vs urban center

Greater Sudbury and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greater Sudbury	Yes	No	No	No
urban center	Yes	No	No	No

Greater Sudbury (noun)	urban center (noun)
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