rookie vs initiate

rookie and initiate both are nouns.

Word	Noun	Adjective	Verb	Adverb
rookie	Yes	No	No	No
initiate	Yes	No	Yes	No

As nouns, initiate is a hypernym of rookie; that is, initiate is a word with a broader meaning than rookie:

Other hypernyms of rookie include beginner, novice, tiro, tyro.

rookie (noun)	initiate (noun)
an awkward and inexperienced youth	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

rookie (verb)	initiate (verb)
	set in motion, start an event or prepare the way for
	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