South America vs Colombia

South America and Colombia both are nouns.

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

South America (noun)	Colombia (noun)
the nations of the South American continent collectively	a republic in northwestern South America with a coastline on the Pacific Ocean and the Caribbean Sea; achieved independence from Spain in 1821 under the leadership of Simon Bolivar; Spanish is the official language
a continent in the western hemisphere connected to North America by the Isthmus of Panama