trip vs touch off

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

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

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

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

trip (noun)	touch off (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

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