inauguration vs initiation

inauguration and initiation both are nouns.

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

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

Other hypernyms of inauguration include induction, installation.

inauguration (noun)	initiation (noun)
the ceremonial induction into a position	the act of starting something for the first time; introducing something new
the act of starting a new operation or practice	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