Cimarron vs Cimarron River

Cimarron and Cimarron River both are nouns.

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

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

Cimarron and Cimarron River: a river that rises in northeastern New Mexico and flows eastward into Oklahoma where it becomes a tributary of the Arkansas River

Cimarron (noun)	Cimarron River (noun)
a river that rises in northeastern New Mexico and flows eastward into Oklahoma where it becomes a tributary of the Arkansas River	a river that rises in northeastern New Mexico and flows eastward into Oklahoma where it becomes a tributary of the Arkansas River