change intensity vs modify

change intensity and modify both are verbs.

Word	Noun	Adjective	Verb	Adverb
change intensity	No	No	Yes	No
modify	No	No	Yes	No

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

Other hypernyms of change intensity include alter, change.

change intensity (verb)	modify (verb)
increase or decrease in intensity	make less severe or harsh or extreme
	add a modifier to a constituent
	cause to change; make different; cause a transformation