EEC vs Common Market

EEC and Common Market both are nouns.

Word	Noun	Adjective	Verb	Adverb
EEC	Yes	No	No	No
Common Market	Yes	No	No	No

As nouns, EEC and Common Market are synonyms defined as:

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

EEC (noun)	Common Market (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