British spelling vs circularise

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

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

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

British spelling (verb)	circularise (verb)
	cause to become widely known
	distribute circulars to
	canvass by distributing letters