Republic of China vs Chinese

Republic of China and Chinese both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of China	Yes	No	No	No
Chinese	Yes	Yes	No	No

Republic of China (noun)	Chinese (noun)
a government on the island of Taiwan established in 1949 by Chiang Kai-shek after the conquest of mainland China by the Communists led by Mao Zedong	any of the Sino-Tibetan languages spoken in China; regarded as dialects of a single language (even though they are mutually unintelligible) because they share an ideographic writing system
	a native or inhabitant of Communist China or of Nationalist China

Republic of China (adjective)	Chinese (adjective)
	of or pertaining to China or its peoples or cultures
	of or relating to or characteristic of the island republic on Taiwan or its residents or their language