Accomplice

Part of speech: noun (n.)

1. A cooperator. [R.] Success unto our valiant general, And happiness to his accomplices! Shak.

2. An associate in the commission of a crime; a participator in an offense, whether a principal or an accessory. "And thou, the cursed accomplice of his treason." Johnson.

Synonyms: Abettor; accessory; assistant; associate; confederate; coadjutor; ally; promoter. See Abettor.