lead off vs set off

lead off and set off both are verbs.

Word	Noun	Adjective	Verb	Adverb
lead off	No	No	Yes	No
set off	No	No	Yes	No

As verbs, set off is a hyponym of lead off; that is, set off is a word with a more specific, narrower meaning than lead off:

lead off (verb)	set off (verb)
set in motion, cause to start	cause to burst with a violent release of energy
teach immoral behavior to	set in motion or cause to begin
	direct attention to, as if by means of contrast
	provoke or stir up
	put in motion or move to act
	depart for someplace
	make up for