There are 105 11-letter words that end with 'ism'.
Note: These 105 11-letter words that end with 'ism' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with lism, nism, tism, rism, cism, hism, dism, mism, vism, eism, pism, oism, yism, gism, bism, aism, sism, uism, kism, fism, iism, jism, xism, wism.
4-letter words end with 'ism' (1)