international organisation vs global organization

international organisation and global organization both are nouns.

Word	Noun	Adjective	Verb	Adverb
international organisation	Yes	No	No	No
global organization	Yes	No	No	No

As nouns, international organisation and global organization are synonyms defined as:

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

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

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