EC vs world organisation

EC and world organisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
EC	Yes	No	No	No
world organisation	Yes	No	No	No

As nouns, world organisation is a hypernym of EC; that is, world organisation is a word with a broader meaning than EC:

EC: an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members
world organisation: an international alliance involving many different countries

EC (noun)	world organisation (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	an international alliance involving many different countries