Neosho River vs Neosho

Neosho River and Neosho both are nouns.

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

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

Neosho River and Neosho: a river that rises in eastern Kansas and flows eastward into Oklahoma to become a tributary of the Arkansas River

Neosho River (noun)	Neosho (noun)
a river that rises in eastern Kansas and flows eastward into Oklahoma to become a tributary of the Arkansas River	a river that rises in eastern Kansas and flows eastward into Oklahoma to become a tributary of the Arkansas River