Nanjing vs People's Republic of China

Nanjing and People's Republic of China both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nanjing	Yes	No	No	No
People's Republic of China	Yes	No	No	No

Nanjing (noun)	People's Republic of China (noun)
a city in eastern China on the Yangtze River; a former capital of China; the scene of a Japanese massacre in the 1930s	a communist nation that covers a vast territory in eastern Asia; the most populous country in the world