south vs South

south and South both are nouns.

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

south (noun)	South (noun)
a location in the southern part of a country, region, or city	the southern states that seceded from the United States in 1861
the cardinal compass point that is at 180 degrees	the region of the United States lying to the south of the Mason-Dixon line
the direction corresponding to the southward cardinal compass point

south (adjective)	South (adjective)
situated in or facing or moving toward or coming from the south

south (adverb)	South (adverb)
in a southern direction