reharmonise vs harmonize

reharmonise and harmonize both are verbs.

Word	Noun	Adjective	Verb	Adverb
reharmonise	No	No	Yes	No
harmonize	No	No	Yes	No

As verbs, harmonize is a hypernym of reharmonise; that is, harmonize is a word with a broader meaning than reharmonise:

Other hypernyms of reharmonise include harmonise.

reharmonise (verb)	harmonize (verb)
provide with a different harmony	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