There are 9 15-letter words that end with 'nism'.
| assimilationism | cosmopolitanism |
| humanitarianism | hyperinsulinism |
| majoritarianism | equalitarianism |
| futilitarianism | interventionism |
| totalitarianism | |
Note: These 9 15-letter words that end with 'nism' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with anism, onism, inism, enism, rnism, unism, gnism.
6-letter words end with 'nism' (3)