British spelling vs authorise

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

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

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

British spelling (verb)	authorise (verb)
	grant authorization or clearance for
	give or delegate power or authority to