Worcester vs urban center

Worcester and urban center both are nouns.

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

Worcester (noun)	urban center (noun)
a cathedral city in west central England on the River Severn	a large and densely populated urban area; may include several independent administrative districts
an industrial and university city in central Massachusetts to the west of Boston
United States lexicographer who was accused of plagiarism by Noah Webster (1784-1865)