diagonalise vs Australian spelling

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

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

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

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