touch off vs spark off

touch off and spark off both are verbs.

Word	Noun	Adjective	Verb	Adverb
touch off	No	No	Yes	No
spark off	No	No	Yes	No

As verbs, touch off and spark off are synonyms defined as:

Other synonyms of touch off include activate, actuate, set off, spark, trigger, trigger off, trip.

touch off (verb)	spark off (verb)
put in motion or move to act	put in motion or move to act