再び【ふたたび】
again, once more, a second time
再開【さいかい】
reopening, resumption, restarting
再建【さいけん】
rebuilding, reconstruction, rehabilitation, protoform reconstruction
再生【さいせい】
restoration to life, coming to life again, resuscitation, regeneration, reformation, rehabilitation, recycling, reclamation, recovery, playback, regeneration (of video or sound), views (of an online video), regeneration (of lost or damage tissue), regrowth, rebirth, reincarnation, recall (memory), retrieval
再三【さいさん】
again and again, repeatedly
再度【さいど】
a second time, again, once more, twice
再会【さいかい】
meeting again, reunion
再起【さいき】
comeback, recovery, restoration, rally
再婚【さいこん】
second marriage, remarriage
再来年【さらいねん】
year after next