urban center vs Nagasaki

urban center and Nagasaki both are nouns.

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

urban center (noun)	Nagasaki (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern Japan on Kyushu; a leading port and shipbuilding center; on August 9, 1945 Nagasaki became the second populated area to receive an atomic bomb