accomplice
noun
[ əˈkʌmplɪs ]
• a person who helps another commit a crime.
• "an accomplice in the murder"
Similar:
abetter,
accessory,
partner in crime,
associate,
confederate,
collaborator,
fellow conspirator,
co-conspirator,
henchman,
conniver,
Origin:
mid 16th century: alteration (probably by association with accompany) of Middle English complice ‘an associate’, via Old French from late Latin complex, complic- ‘allied’, from com- ‘together’ + the root of plicare ‘to fold’.