British spelling vs decimalise

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

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

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

British spelling (verb)	decimalise (verb)
	change to the decimal system
	change from fractions to decimals