urban center vs Bremerhaven

urban center and Bremerhaven both are nouns.

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

urban center (noun)	Bremerhaven (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city in northwestern Germany at the mouth of the Weser River on the North Sea; has a deep natural harbor and is an important shipping center