inaugural vs initiation

inaugural and initiation both are nouns.

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

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

Other hypernyms of inaugural include induction, installation.

inaugural (noun)	initiation (noun)
the ceremonial induction into a position	the act of starting something for the first time; introducing something new
an address delivered at an inaugural ceremony (especially by a United States president)	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

inaugural (adjective)	initiation (adjective)
occurring at or characteristic of a formal investiture or induction
serving to set in motion