Australian spelling vs diagonalise

Australian spelling is a noun but diagonalise is not a noun.

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

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

Australian spelling (verb)	diagonalise (verb)
	transform a matrix to a diagonal matrix