Red River of the South vs Lone-Star State

Red River of the South and Lone-Star State both are nouns.

Word	Noun	Adjective	Verb	Adverb
Red River of the South	Yes	No	No	No
Lone-Star State	Yes	No	No	No

Red River of the South (noun)	Lone-Star State (noun)
a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana	the second largest state; located in southwestern United States on the Gulf of Mexico