urban center vs Danzig

urban center and Danzig both are nouns.

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

urban center (noun)	Danzig (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city of northern Poland near the mouth of the Vistula River on a gulf of the Baltic Sea; a member of the Hanseatic League in the 14th century