There are 92 words that end with 'back'.
Note: These 92 words that end with 'back' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with eback, tback, lback, hback, rback, yback, wback, dback, kback, nback, aback, gback, pback, sback, fback, mback.