urban center vs Potsdam

urban center and Potsdam both are nouns.

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

urban center (noun)	Potsdam (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in northeastern Germany; site of the Potsdam Conference in the summer of 1945