There are 5 15-letter words that end with 'tism'.
| hermaphroditism | hyperparasitism |
| neoconservatism | superparasitism |
| superpatriotism | |
Note: These 5 15-letter words that end with 'tism' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with atism, otism, itism, etism, ntism, utism, ptism, ttism, ytism, ftism, htism, ltism, rtism, stism.
6-letter words end with 'tism' (2)