world organization vs international organization

world organization and international organization both are nouns.

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

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

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

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

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