- confederate, collaborator, henchman, partner in crime - someone who assists in a plot
--1 is a kind of accessory, accessary
- collaborator, collaborationist, quisling - someone who collaborates with an enemy occupying force
--2 is a kind of traitor, treasonist
Derived form: verb collaborate2 - collaborator, cooperator, partner, pardner - an associate who works with others toward a common goal; "partners in crime"
--3 is a kind of associate
--3 has particulars: bridge partner; dancing partnerDerived form: verb collaborate1