institutionalise vs Australian spelling

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

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

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

institutionalise (verb)	Australian spelling (verb)
cause to be admitted; of persons to an institution