Nanking vs Nanjing

Nanking and Nanjing both are nouns.

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

As nouns, Nanking and Nanjing are synonyms defined as:

Nanking and Nanjing: a city in eastern China on the Yangtze River; a former capital of China; the scene of a Japanese massacre in the 1930s

Nanking (noun)	Nanjing (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 city in eastern China on the Yangtze River; a former capital of China; the scene of a Japanese massacre in the 1930s