British spelling vs singularise

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

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

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

British spelling (verb)	singularise (verb)
	distinguish as singular