Arauca River vs Arauca

Arauca River and Arauca both are nouns.

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

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

Arauca River and Arauca: a river that rises in northern Colombia and flows generally eastward to the Orinoco in central Venezuela

Arauca River (noun)	Arauca (noun)
a river that rises in northern Colombia and flows generally eastward to the Orinoco in central Venezuela	a river that rises in northern Colombia and flows generally eastward to the Orinoco in central Venezuela