Dortmund vs urban center

Dortmund and urban center both are nouns.

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

Dortmund (noun)	urban center (noun)
an industrial city in northwestern Germany; flourished from the 13th to 17th century as a member of the Hanseatic League	a large and densely populated urban area; may include several independent administrative districts