South vs Old South

South and Old South both are nouns.

Word	Noun	Adjective	Verb	Adverb
South	Yes	No	No	No
Old South	Yes	No	No	No

South (noun)	Old South (noun)
the southern states that seceded from the United States in 1861	the South of the United States before the American Civil War
the region of the United States lying to the south of the Mason-Dixon line