Australian spelling vs euthanise

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

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

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

Australian spelling (verb)	euthanise (verb)
	intentionally cause the painless death of a person or animal