river vs Missouri

river and Missouri both are nouns.

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

river (noun)	Missouri (noun)
a large natural stream of water (larger than a creek)	a dialect of the Chiwere language spoken by the Missouri
	a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union
	the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis
	a member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri