instigation vs initiation

instigation and initiation both are nouns.

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

As nouns, initiation is a hypernym of instigation; that is, initiation is a word with a broader meaning than instigation:

Other hypernyms of instigation include induction, trigger.

instigation (noun)	initiation (noun)
deliberate and intentional triggering (of trouble or discord)	the act of starting something for the first time; introducing something new
the verbal act of urging on	an act that sets in motion some course of events
	wisdom as evidenced by the possession of knowledge
	a formal entry into an organization or position or office