legitimise vs British spelling

legitimise is not a noun while British spelling is a noun.

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

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

legitimise (verb)	British spelling (verb)
make legal