Mississippi vs Tombigbee River

Mississippi and Tombigbee River both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mississippi	Yes	No	No	No
Tombigbee River	Yes	No	No	No

Mississippi (noun)	Tombigbee River (noun)
a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War	a river that rises in northeastern Mississippi and flows southward through western Alabama to join the Alabama River and form the Mobile River
a major North American river and the chief river of the United States; rises in northern Minnesota and flows southward into the Gulf of Mexico