Communist China vs People's Republic of China

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

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

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

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

Other synonyms of Communist China include Cathay, China, mainland China, PRC, Red China.

Communist China (noun)	People's Republic of 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