There are numerous synonyms for the phrase "let out of prison," including release, parole, discharge, liberation, and freedom. All of these words essentially describe the act of releasing a prisoner from incarceration. "Release" is probably the most commonly used synonym and describes the end of a prisoner's sentence and their return to society. "Parole" is a legal agreement that allows a prisoner to serve the remainder of their sentence outside of jail, subject to certain conditions. "Discharge" refers to the end of a prisoner's sentence based on good behavior or due to legal technicalities. "Liberation" and "freedom" both connote a sense of release from confinement or captivity.