river vs Araguaya River

river and Araguaya River both are nouns.

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

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