roar off vs set off

roar off and set off both are verbs.

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

As verbs, set off is a hypernym of roar off; that is, set off is a word with a broader meaning than roar off:

Other hypernyms of roar off include depart, part, set forth, set out, start, start out, take off.

roar off (verb)	set off (verb)
leave at high speed making a loud sound	cause to burst with a violent release of energy
	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