Southern Hemisphere vs South America

Southern Hemisphere and South America both are nouns.

Word	Noun	Adjective	Verb	Adverb
Southern Hemisphere	Yes	No	No	No
South America	Yes	No	No	No

Southern Hemisphere (noun)	South America (noun)
the hemisphere to the south of the equator	the nations of the South American continent collectively
	a continent in the western hemisphere connected to North America by the Isthmus of Panama