sterilise vs Australian spelling

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

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

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

sterilise (verb)	Australian spelling (verb)
make infertile
make free from bacteria