Araguaia vs Araguaia River

Araguaia and Araguaia River both are nouns.

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

As nouns, Araguaia and Araguaia River are synonyms defined as:

Araguaia and Araguaia River: a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River

Other synonyms of Araguaia include Araguaya, Araguaya River.

Araguaia (noun)	Araguaia River (noun)
a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River	a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River