initiate vs go back

initiate is a noun but go back is not a noun.

Word	Noun	Adjective	Verb	Adverb
initiate	Yes	No	Yes	No
go back	No	No	Yes	No

As verbs, go back is a hyponym of initiate; that is, go back is a word with a more specific, narrower meaning than initiate:

Other hyponyms of initiate include initiate, lead up, set, date back, date from.

initiate (noun)	go back (noun)
people who have been introduced to the mysteries of some field or activity
someone who has been admitted to membership in a scholarly field
someone new to a field or activity

initiate (verb)	go back (verb)
set in motion, start an event or prepare the way for	regain a former condition after a financial loss
bring up a topic for discussion	return in thought or speech to something
take the lead or initiative in; participate in the development of	belong to an earlier time
bring into being
accept people into an exclusive society or group, usually with some rite