Osage vs Osage River

Osage and Osage River both are nouns.

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

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

Osage and Osage River: a river in Missouri that is a tributary of the Missouri River

Osage (noun)	Osage River (noun)
the Dhegiha dialect spoken by the Osage	a river in Missouri that is a tributary of the Missouri River
a river in Missouri that is a tributary of the Missouri River
a member of the Siouan people formerly living in Missouri in the valleys of the Missouri and Osage rivers; oil was found on Osage lands early in the 20th century