unionise vs British spelling

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

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

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

unionise (verb)	British spelling (verb)
form or join a union
recruit for a union or organize into a union