Definitions:

1. A person who helps another commit a crime. NOUN
   • The accomplice confessed to the crime.
2. a person who joins with another in carrying out some plan, usually an unethical or illegal plan noun
   • The accomplice was given a harsh sentence for driving the getaway vehicle.
3. One associated with another especially in wrongdoing. NOUN
   • The police are hoping the accomplice will lead them to the mastermind of the crime.

Synonyms:

• Accessory
• Associate
• Collaborator
• confederate