EEC vs European Community

EEC and European Community both are nouns.

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

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

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

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

EEC (noun)	European Community (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