Tutor - similar to a teacher, but usually on a one-on-one basis. Adviser - gives a person guidance or assistance on a particular matter. Similar to counselor in some ways and depending on what capacity they work in. Supervisor - a person watches over other people or a larger group or organization. They will also give orders or directions to that person or group of people. You can think of them as a "boss," to put it in other words. Does this help? If you are still confused, please let me know.