U.S. vs South

U.S. and South both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
South	Yes	No	No	No

U.S. (noun)	South (noun)
the executive and legislative and judicial branches of the federal government of the United States	the southern states that seceded from the United States in 1861
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776	the region of the United States lying to the south of the Mason-Dixon line