British spelling vs harmonise

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

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

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

British spelling (verb)	harmonise (verb)
	bring into consonance, harmony, or accord while making music or singing
	bring into consonance or accord
	bring (several things) into consonance or relate harmoniously
	sing or play in harmony
	write a harmony for
	go together