Red River of the South vs Louisiana

Red River of the South and Louisiana both are nouns.

Word	Noun	Adjective	Verb	Adverb
Red River of the South	Yes	No	No	No
Louisiana	Yes	No	No	No

Red River of the South (noun)	Louisiana (noun)
a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana	a state in southern United States on the Gulf of Mexico; one of the Confederate states during the American Civil War