spark off vs touch off

spark off and touch off both are verbs.

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

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

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

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