Common Market vs EC

Common Market and EC both are nouns.

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

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

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

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

Common Market (noun)	EC (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