harmonise vs modify

harmonise and modify both are verbs.

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

As verbs, modify is a hypernym of harmonise; that is, modify is a word with a broader meaning than harmonise:

harmonise: bring into consonance, harmony, or accord while making music or singing
modify: cause to change; make different; cause a transformation

Other hypernyms of harmonise include alter, change.

harmonise (verb)	modify (verb)
bring into consonance, harmony, or accord while making music or singing	make less severe or harsh or extreme
bring into consonance or accord	add a modifier to a constituent
bring (several things) into consonance or relate harmoniously	cause to change; make different; cause a transformation
sing or play in harmony
write a harmony for
go together