megalithic structure vs Europe

megalithic structure and Europe both are nouns.

Word	Noun	Adjective	Verb	Adverb
megalithic structure	Yes	No	No	No
Europe	Yes	No	No	No

megalithic structure (noun)	Europe (noun)
memorial consisting of a very large stone forming part of a prehistoric structure (especially in western Europe)	an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members
	the nations of the European continent collectively
	the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles