Gloucester vs urban center

Gloucester and urban center both are nouns.

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

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