international organisation vs British spelling

international organisation and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
international organisation	Yes	No	No	No
British spelling	Yes	No	No	No

international organisation (noun)	British spelling (noun)
an international alliance involving many different countries	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')