Great Wall vs Great Wall of China

Great Wall and Great Wall of China both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Wall	Yes	No	No	No
Great Wall of China	Yes	No	No	No

As nouns, Great Wall and Great Wall of China are synonyms defined as:

Great Wall and Great Wall of China: a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width

Other synonyms of Great Wall include Chinese Wall.

Great Wall (noun)	Great Wall of China (noun)
a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width	a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width