British spelling vs euthanatise

British spelling is a noun but euthanatise is not a noun.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
euthanatise	No	No	Yes	No

British spelling (noun)	euthanatise (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

British spelling (verb)	euthanatise (verb)
	intentionally cause the painless death of a person or animal