There are 10 15-letter words that end with 'nation'.
| codetermination | decontamination |
| dehydrogenation | indetermination |
| insubordination | postpollination |
| postvaccination | recontamination |
| redetermination | procrastination |
Note: These 10 15-letter words that end with 'nation' are found from the USA & Canada version of the tournament Scrabble word list.