discolorise vs Australian spelling

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

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

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

discolorise (verb)	Australian spelling (verb)
cause to become white or lighter in color