People's Republic of China vs Communist China

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

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

As nouns, People's Republic of China and Communist China are synonyms defined as:

People's Republic of China and Communist China: a communist nation that covers a vast territory in eastern Asia; the most populous country in the world

Other synonyms of People's Republic of China include Cathay, China, mainland China, PRC, Red China.

People's Republic of China (noun)	Communist China (noun)
a communist nation that covers a vast territory in eastern Asia; the most populous country in the world	a communist nation that covers a vast territory in eastern Asia; the most populous country in the world