trigger vs instigation

trigger and instigation both are nouns.

Word	Noun	Adjective	Verb	Adverb
trigger	Yes	No	Yes	No
instigation	Yes	No	No	No

As nouns, instigation is a hyponym of trigger; that is, instigation is a word with a more specific, narrower meaning than trigger:

Other hyponyms of trigger include fomentation.

trigger (noun)	instigation (noun)
an act that sets in motion some course of events	deliberate and intentional triggering (of trouble or discord)
lever that activates the firing mechanism of a gun	the verbal act of urging on
a device that activates or releases or causes something to happen

trigger (verb)	instigation (verb)
release or pull the trigger on
put in motion or move to act