Accomplice is a person that helps the principal physically, whereas an accessory may be and usually refers to him, who is absent in the crime scene and assists the principal mentally.
What is the difference between enforcement and implementation?
Enforcement is a use of force to actualize what is written in laws. It is similar to execution; only less challenging. An execution is enforcement where it faces a possible private opposition.
Whereas, implementation is making real what was already designed.
Therefore, enforcement, and in more general sence execution, is a practice of the legislation, whereas implementation is a practice of a completed design.