Australian spelling vs amortisation

Australian spelling and amortisation both are nouns.

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

Australian spelling (noun)	amortisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	payment of an obligation in a series of installments or transfers
	the reduction of the value of an asset by prorating its cost over a period of years