EC vs United Kingdom of Great Britain and Northern Ireland

EC and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
EC	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

EC (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom