reharmonisation vs Australian spelling

reharmonisation and Australian spelling both are nouns.

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

reharmonisation (noun)	Australian spelling (noun)
a piece of music whose original harmony has been revised	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')