- accomplice
- naccessory or Chiefly Law. accessary, Law. accessory before or after the fact, Law. principal, partner in crime, Sl. gun moll or moll, Law. parti-ceps criminis, socius criminis; confederate, abettor, aider, collaborator, cooperator, contributor, cohort, conspirator, fellow conspirator, conspirer, conniver, participant, participator; ally, partner, comrade, colleague, associate, consociate, socius, yokefellow or yokemate, helpmate, helpmeet, Obs. helpfellow, coworker, co-aid, co-partner, consort, confrere, sidekick, friend, Chiefly Brit. mate; helper, aid or aide, attendant, acolyte, deputy, subsidiary, auxiliary, ancilla, second, henchman, right hand, right-hand man, recruit, tool, Sl. stooge, Sl. gofer.
A Note on the Style of the synonym finder. 2014.