river vs Arauca

river and Arauca both are nouns.

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

river (noun)	Arauca (noun)
a large natural stream of water (larger than a creek)	a river that rises in northern Colombia and flows generally eastward to the Orinoco in central Venezuela