South America vs accumulation

South America and accumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
South America	Yes	No	No	No
accumulation	Yes	No	No	No

As nouns, accumulation is a hypernym of South America; that is, accumulation is a word with a broader meaning than South America:

Other hypernyms of South America include aggregation, assemblage, collection.

South America (noun)	accumulation (noun)
the nations of the South American continent collectively	the act of accumulating
a continent in the western hemisphere connected to North America by the Isthmus of Panama	several things grouped together or considered as a whole
	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition