reharmonisation vs British spelling

reharmonisation and British spelling both are nouns.

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

reharmonisation (noun)	British spelling (noun)
a piece of music whose original harmony has been revised	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')