General Synonyms:
* Delay: A postponement or temporary suspension.
* Respite: A temporary break from something difficult or unpleasant.
* Relief: A lessening of pain, anxiety, or hardship.
* Pardon: Forgiveness or release from punishment.
* Stay: A temporary suspension of a legal process.
More Specific Synonyms:
* Commutation: (Legal) The reduction of a sentence, especially from death to life imprisonment.
* Clemency: Mercy or leniency shown by a person in authority.
* Suspension: A temporary stoppage or interruption.
* Postponement: A delay or putting off of something.
The best synonym for "reprieve" will depend on the specific context and the intended meaning.