Cathay vs PRC

Cathay and PRC both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cathay	Yes	No	No	No
PRC	Yes	No	No	No

As nouns, Cathay and PRC are synonyms defined as:

Cathay and PRC: a communist nation that covers a vast territory in eastern Asia; the most populous country in the world

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

Cathay (noun)	PRC (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