British spelling vs relativise

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

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

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

British spelling (verb)	relativise (verb)
	consider or treat as relative