European Union vs Greece

European Union and Greece both are nouns.

Word	Noun	Adjective	Verb	Adverb
European Union	Yes	No	No	No
Greece	Yes	No	No	No

European Union (noun)	Greece (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil
	ancient Greece; a country of city-states (especially Athens and Sparta) that reached its peak in the fifth century BCE