Mississipi and Mississippi River

Mississippi River and mississipi are semantically related. In some cases you can use "Mississippi River" instead a noun "Mississipi".

Mississippi River noun - 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.

Mississipi and Mississippi River are semantically related. You can use "Mississipi" instead a noun phrase "Mississippi River".