The best replacement for relapse is recurrence.

The best alternatives to relapse are rated as following:
★★★★★  recurrence
★★★★  recovery
★★★★  slip
★★★  remission
★★  refractory
★★  mmlp2
★  reinfection
★  lapse
★  recrudescence
★  encore
★  blueprint 3
★  recovery eminem
★  relapse refill
★  recurrence cancer
★  progression
  rebound
  rebirth
  slim shady lp
  recurrent

Your alternative for relapse is not listed? Suggest!
Speaking about relapse, one probably shouldn't forget about all.

Other search terms related to relapse and their ratings are:
★★★★★ all
You have in mind a companion for relapse and it is not yet here? Propose!



Google Trends

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relapse
recurrence
recovery