European Community vs EU

European Community and EU both are nouns.

Word	Noun	Adjective	Verb	Adverb
European Community	Yes	No	No	No
EU	Yes	No	No	No

As nouns, European Community and EU are synonyms defined as:

European Community and EU: an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members

Other synonyms of European Community include Common Market, EC, EEC, Europe, European Economic Community, European Union.

European Community (noun)	EU (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members