Australian spelling vs extemporisation

Australian spelling and extemporisation both are nouns.

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

Australian spelling (noun)	extemporisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a performance given extempore without planning or preparation