What's the difference between an acting coach and mentor?

I'm sure that only people that are very familiar with the acting world would understand this, but what's difference? Can't an acting coach be your mentor? Does a mentor have to be a professional at all?

Thanks!

Certainly your acting coach can be your mentor. A mentor advises, a coach teaches you things to use as an actor. It certainly does make sense if your mentor has been or is a professional in your area.