1. (

• confederate ,
• collaborator ,
• henchman ,
• partner_in_crime

) someone who assists in a plot ;

2. (

• collaborator ,
• collaborationist ,
• quisling

) someone who collaborates with an enemy occupying force ;

3. (

• collaborator ,
• cooperator ,
• partner ,
• pardner

) an associate in an activity or endeavor or sphere of common interest; "the musician and the librettist were collaborators"; "sexual partners" ;