urban center vs Gloucester

urban center and Gloucester both are nouns.

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

urban center (noun)	Gloucester (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southwestern England in Gloucestershire on the Severn
	a town in northeastern Massachusetts on Cape Ann to the northeast of Boston; the harbor has been a fishing center for centuries