Mentee is the correct word in modern usage, but Mentoree would arguably be more "correct" etymologically in that Mentor is a proper noun that has been "verbed"

Mentee is the correct word in modern usage, but Mentoree would arguably be more "correct" etymologically in that Mentor is a proper noun that has been "verbed" [1], not "one who ments". [1] https://en.m.wikipedia.org/wiki/Mentor_(Odyssey) https://en.m.wikipedia.org/wiki/Mentor_(Odyssey)