Guiana Shield vs South America

Guiana Shield and South America both are nouns.

Word	Noun	Adjective	Verb	Adverb
Guiana Shield	Yes	No	No	No
South America	Yes	No	No	No

Guiana Shield (noun)	South America (noun)
a mountainous tableland in northern South America; extends from Venezuela into Guyana and northern Brazil	the nations of the South American continent collectively
	a continent in the western hemisphere connected to North America by the Isthmus of Panama