symmetrise vs British spelling

symmetrise is not a noun while British spelling is a noun.

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

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

symmetrise (verb)	British spelling (verb)
make symmetric