We don't have synonyms for plea-bargain yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are plea bargain and plea-bargains.
(v) :
(US, law) To make an agreement in which a defendant agrees to plead guilty to a lesser charge instead of not guilty to a greater one.
(n) :
(US, law) Alternative form of plea bargain (“an agreement between a defendant and the prosecution in which the defendant agrees to a plea such as guilty or nolo contendere to a lesser charge rather than contesting a greater charge”). [(US, law) An agreement in which a defendant agrees to plead guilty to a lesser charge instead of not guilty to a greater one]
(v) :
(US, law) To make an agreement in which a defendant agrees to plead guilty to a lesser charge instead of not guilty to a greater one.
(n) :
(US, law) Alternative form of plea bargain (“an agreement between a defendant and the prosecution in which the defendant agrees to a plea such as guilty or nolo contendere to a lesser charge rather than contesting a greater charge”). [(US, law) An agreement in which a defendant agrees to plead guilty to a lesser charge instead of not guilty to a greater one]