set off vs occur

set off and occur both are verbs.

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

set off (verb)	occur (verb)
cause to burst with a violent release of energy	come to pass
set in motion or cause to begin	come to one's mind; suggest itself
direct attention to, as if by means of contrast	to be found to exist
provoke or stir up
put in motion or move to act
depart for someplace
make up for