Australian spelling vs small-capitalisation

Australian spelling is a noun but small-capitalisation is not a noun.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
small-capitalisation	No	Yes	No	No

Australian spelling (noun)	small-capitalisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

Australian spelling (adjective)	small-capitalisation (adjective)
	of stocks of companies with a market capitalization of less than one billion dollars