British spelling vs italicise

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

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

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

British spelling (verb)	italicise (verb)
	print in italics