Hong Kong vs urban center

Hong Kong and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hong Kong	Yes	No	No	No
urban center	Yes	No	No	No

Hong Kong (noun)	urban center (noun)
formerly a Crown Colony on the coast of southern China in Guangdong province; leased by China to Britain in 1842 and returned in 1997; one of the world's leading commercial centers	a large and densely populated urban area; may include several independent administrative districts