initiation vs ceremony

initiation and ceremony both are nouns.

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

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

Other hypernyms of initiation include ceremonial, ceremonial occasion, observance.

initiation (noun)	ceremony (noun)
the act of starting something for the first time; introducing something new	the proper or conventional behavior on some solemn occasion
an act that sets in motion some course of events	any activity that is performed in an especially solemn elaborate or formal way
wisdom as evidenced by the possession of knowledge	a formal event performed on a special occasion
a formal entry into an organization or position or office