authorship vs initiation

authorship and initiation both are nouns.

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

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

authorship: the act of initiating a new idea or theory or writing
initiation: the act of starting something for the first time; introducing something new

authorship (noun)	initiation (noun)
the act of creating written works	the act of starting something for the first time; introducing something new
the act of initiating a new idea or theory or writing	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