international organization vs global organization

international organization and global organization both are nouns.

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

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

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

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

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