musical organisation vs British spelling

musical organisation and British spelling both are nouns.

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

musical organisation (noun)	British spelling (noun)
an organization of musicians who perform together	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')