British spelling vs secularise

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

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

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

British spelling (verb)	secularise (verb)
	make secular and draw away from a religious orientation