British spelling vs immunise

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

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

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

British spelling (verb)	immunise (verb)
	perform vaccinations or produce immunity in by inoculation
	grant immunity from prosecution