Araguaya River vs Araguaya

Araguaya River and Araguaya both are nouns.

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

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

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

Other synonyms of Araguaya River include Araguaia, Araguaia River.

Araguaya River (noun)	Araguaya (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