urban center vs Burlington

urban center and Burlington both are nouns.

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

urban center (noun)	Burlington (noun)
a large and densely populated urban area; may include several independent administrative districts	the largest city in Vermont; located in northwestern Vermont on Lake Champlain; site of the University of Vermont