AR vs Saint Francis River

AR and Saint Francis River both are nouns.

Word	Noun	Adjective	Verb	Adverb
AR	Yes	No	No	No
Saint Francis River	Yes	No	No	No

AR (noun)	Saint Francis River (noun)
a state in south central United States; one of the Confederate states during the American Civil War	a tributary of the Mississippi River that rises in Missouri and flows southeastward through Arkansas