There are 9 words that end with 'thm'.
| rhythm | isarithm |
| algorithm | biorhythm |
| logarithm | polyrhythm |
| cologarithm | cryptarithm |
| antilogarithm | |
Note: These 9 words that end with 'thm' are found from the USA & Canada version of the tournament Scrabble word list.