1) Cilinarian 2) Coconspirator 3) Fawkes 4) Machinator 5) Oates 6) Plotter 7) Schemer 1) Coconspirator 2) Collaborator 3) Criminal 4) Crook 5) Defector 6) Deserter 7) Double agent 8) Felon 9) French word used in English 10) Machinator 11) Malefactor 12) Member of a cabal 13) Outlaw 14) Plotter 15) Turncoat 
• (n.) One who engages in a conspiracy; a plotter.
Con·spir'a·tor noun One who engages in a conspiracy; a plotter. 2 Sam. xv. 31. 
A person that is a party to a conspiracy -- that is,someone that enters into an agreement to commit illegal acts, or to commit legal acts using illegal means.
[n] - a member of a conspiracy
coconspirator noun a member of a conspiracy
a person who takes part in a conspiracy; plotter.