EC vs world organization

EC and world organization both are nouns.

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

As nouns, world organization is a hypernym of EC; that is, world organization 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 organization: an international alliance involving many different countries

EC (noun)	world organization (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