1) Criminal 2) Crook 3) Felon 4) Hijacker 5) Malefactor 6) Outlaw 1) Footpad 2) Highwayman 3) Hijacker 4) Padder 5) Turpin 
[n] - someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination 2. [n] - a holdup man who stops a vehicle and steals from it