harmonisation vs British spelling

harmonisation and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
harmonisation	Yes	No	No	No
British spelling	Yes	No	No	No

harmonisation (noun)	British spelling (noun)
singing in harmony	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
a piece of harmonized music