WordNet (r) 3.0 (2006):

rebirth
    n 1: after death the soul begins a new cycle of existence in
         another human body [syn: metempsychosis, rebirth]
    2: a second or new birth [syn: reincarnation, rebirth,
       renascence]
    3: the revival of learning and culture [syn: rebirth,
       Renaissance, Renascence]
    4: a spiritual enlightenment causing a person to lead a new life
       [syn: conversion, rebirth, spiritual rebirth]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "rebirth":
   adoption, amendment, change of allegiance, change of heart,
   change of mind, circumcision, conversion, copy, doubling,
   duplication, echo, imitation, improvement, metempsychosis,
   new beginning, new birth, new life, palingenesis, palingenesy,
   plagiarism, quotation, re-creation, re-formation, reanimation,
   reappearance, rebuilding, reclamation, reconstitution,
   reconstruction, recrudescence, recurrence, redeemedness,
   redemption, redesign, redoing, redoubling, reduplication, reecho,
   reedition, reestablishment, refashioning, reform, reformation,
   refreshment, regeneracy, regenerateness, regeneration, regenesis,
   regurgitation, reincarnation, reinstitution, reissue, rejuvenation,
   rejuvenescence, remaking, renaissance, renascence, renewal,
   renovation, reoccurrence, reorganization, repetition, reprinting,
   reproduction, reshaping, restoration, restructuring, resumption,
   resurgence, resurrection, resuscitation, return, revision,
   revitalization, revival, revivescence, revivescency,
   revivification, salvation, second birth, second wind, second youth,
   spiritual purification