touch off vs trip

touch off is not a noun while trip is a noun.

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

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

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

touch off (noun)	trip (noun)
	a journey for some purpose (usually including the return)
	an unintentional but embarrassing blunder
	a light or nimble tread
	a catch mechanism that acts as a switch
	an accidental misstep threatening (or causing) a fall
	an exciting or stimulating experience
	a hallucinatory experience induced by drugs

touch off (verb)	trip (verb)
put in motion or move to act	get high, stoned, or drugged
	put in motion or move to act
	miss a step and fall or nearly fall
	cause to stumble
	make a trip for pleasure