harmonise vs harmoniser

harmonise is not a noun while harmoniser is a noun.

Word	Noun	Adjective	Verb	Adverb
harmonise	No	No	Yes	No
harmoniser	Yes	No	No	No

harmonise (noun)	harmoniser (noun)
	a mediator who brings one thing into harmonious agreement with another
	a musician who sings or plays in harmony

harmonise (verb)	harmoniser (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