international organisation vs world organisation

international organisation and world organisation both are nouns.

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

As nouns, international organisation and world organisation are synonyms defined as:

international organisation and world organisation: an international alliance involving many different countries

Other synonyms of international organisation include global organization, international organization, world organization.

international organisation (noun)	world organisation (noun)
an international alliance involving many different countries	an international alliance involving many different countries