Europe vs megalithic structure

Europe and megalithic structure both are nouns.

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

Europe (noun)	megalithic structure (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	memorial consisting of a very large stone forming part of a prehistoric structure (especially in western Europe)
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