cycle of rebirth vs rebirth

cycle of rebirth and rebirth both are nouns.

Word	Noun	Adjective	Verb	Adverb
cycle of rebirth	Yes	No	No	No
rebirth	Yes	No	No	No

As nouns, rebirth is a hypernym of cycle of rebirth; that is, rebirth is a word with a broader meaning than cycle of rebirth:

Other hypernyms of cycle of rebirth include reincarnation, renascence.

cycle of rebirth (noun)	rebirth (noun)
(Hinduism) repeated rebirth in new forms	a spiritual enlightenment causing a person to lead a new life
	the revival of learning and culture
	a second or new birth
	after death the soul begins a new cycle of existence in another human body