initiate vs date back

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

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

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

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

initiate (noun)	date 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)	date back (verb)
set in motion, start an event or prepare the way for	belong to an earlier time
bring up a topic for discussion
take the lead or initiative in; participate in the development of
bring into being
accept people into an exclusive society or group, usually with some rite