world organization vs world organisation

world organization and world organisation both are nouns.

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

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

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

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

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