Hunan province vs mainland China

Hunan province and mainland China both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hunan province	Yes	No	No	No
mainland China	Yes	No	No	No

Hunan province (noun)	mainland China (noun)
a province in southeastern central China between the Nan Ling mountains and the Chang Jiang; noted for its timber and valuable mineral resources	a communist nation that covers a vast territory in eastern Asia; the most populous country in the world