Rostock vs urban center

Rostock and urban center both are nouns.

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

Rostock (noun)	urban center (noun)
a city in northeastern Germany near the Baltic sea; an important member of the Hanseatic League in the 14th century	a large and densely populated urban area; may include several independent administrative districts