birth vs rebirth

birth and rebirth both are nouns.

Word	Noun	Adjective	Verb	Adverb
birth	Yes	No	Yes	No
rebirth	Yes	No	No	No

As nouns, rebirth is a hyponym of birth; that is, rebirth is a word with a more specific, narrower meaning than birth:

birth (noun)	rebirth (noun)
the event of being born	a spiritual enlightenment causing a person to lead a new life
a baby born; an offspring	the revival of learning and culture
the process of giving birth	a second or new birth
the kinship relation of an offspring to the parents	after death the soul begins a new cycle of existence in another human body
the time when something begins (especially life)

birth (verb)	rebirth (verb)
cause to be born