There are 15 words that end with 'onises'.
| ionises | adonises |
| agonises | ebonises |
| lionises | ozonises |
| canonises | colonises |
| demonises | unionises |
| harmonises | patronises |
| skeletonises | synchronises |
| revolutionises | |
Note: These 15 words that end with 'onises' are found from the USA & Canada version of the tournament Scrabble word list.