China vs Nanjing

China and Nanjing both are nouns.

Word	Noun	Adjective	Verb	Adverb
China	Yes	No	No	No
Nanjing	Yes	No	No	No

China (noun)	Nanjing (noun)
a communist nation that covers a vast territory in eastern Asia; the most populous country in the world	a city in eastern China on the Yangtze River; a former capital of China; the scene of a Japanese massacre in the 1930s
a government on the island of Taiwan established in 1949 by Chiang Kai-shek after the conquest of mainland China by the Communists led by Mao Zedong