metropolis vs Nanking

metropolis and Nanking both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Nanking	Yes	No	No	No

metropolis (noun)	Nanking (noun)
people living in a large densely populated municipality	a city in eastern China on the Yangtze River; a former capital of China; the scene of a Japanese massacre in the 1930s
a large and densely populated urban area; may include several independent administrative districts