river vs Brahmaputra River

river and Brahmaputra River both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Brahmaputra River	Yes	No	No	No

river (noun)	Brahmaputra River (noun)
a large natural stream of water (larger than a creek)	an Asian river; flows into the Bay of Bengal