Tocantins River vs river

Tocantins River and river both are nouns.

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

Tocantins River (noun)	river (noun)
a river in eastern Brazil that flows generally north to the Para River	a large natural stream of water (larger than a creek)