What is the difference between assassins and snipers?

Unlike medieval assassins, ninjas had morals and were very experienced in the Martial Arts as well as the art of hiding in plain sight. Through research, ninja weren't only used for assassination purposes, but as were also used in espionage, in which some elements of which were the basis for unconventional warfare and other techniques as practiced by special operations forces today. There are many other differences that I can't really explain right now, but feel free to research more on ninja and medieval assassins and find the differences on your own.