urban center vs Murmansk

urban center and Murmansk both are nouns.

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

urban center (noun)	Murmansk (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city in northwestern Russia on the Kola Peninsula; the largest city to the north of the Arctic Circle; an important supply line to Russia in World War I and World War II