Araguaia River vs river

Araguaia River and river both are nouns.

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

Araguaia River (noun)	river (noun)
a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River	a large natural stream of water (larger than a creek)