Brahmaputra River vs mainland China

Brahmaputra River and mainland China both are nouns.

Word	Noun	Adjective	Verb	Adverb
Brahmaputra River	Yes	No	No	No
mainland China	Yes	No	No	No

Brahmaputra River (noun)	mainland China (noun)
an Asian river; flows into the Bay of Bengal	a communist nation that covers a vast territory in eastern Asia; the most populous country in the world