Araguaya River vs Araguaia River

Araguaya River and Araguaia River both are nouns.

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

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

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

Other synonyms of Araguaya River include Araguaia, Araguaya.

Araguaya River (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