There are 12 words that end with 'irms'.
| firms | chirms | affirms |
| infirms | squirms | thairms |
| confirms | reaffirms | disaffirms |
| reconfirms | superfirms | disconfirms |
Note: These 12 words that end with 'irms' are found from the USA & Canada version of the tournament Scrabble word list.