The antonym of mentor is mentee. Whilst not entymologically correct, the OED has accepted this as an appropriate antonym.
instructor
Another word for "advisor" is "mentor" in English.
The opposite of a mentor is a protege, or pupil.
epitome, example, exemplar, good example, hero, heroine, idol, mentor, paragon, shining example, star, superstar, very model
Something that means the same or almost the same as
The opposite of instructor would be "student" or pupil (one who is instructed).
mentor, counsel, guide, master, advisor
Another word for "advisor" is "mentor" in English.
A mentor should always be a person who has greater experience than the mentee.
role
The opposite of a mentor is a protege, or pupil.
epitome, example, exemplar, good example, hero, heroine, idol, mentor, paragon, shining example, star, superstar, very model
He is the mentor of Simba the protagonist in the Lion King.
Emmett Till role model was his mother.
You could use a mentor, or a teacher.
Something that means the same or almost the same as
The opposite of instructor would be "student" or pupil (one who is instructed).
A role model is more like a person that someone looks up to and wants to be like. A mentor is like a person who helps other people or guides them in the right direction.