Greece vs European Union

Greece and European Union both are nouns.

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

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