There are 16 words that start with 'relax'.
| relax | relaxed |
| relaxer | relaxes |
| relaxin | relaxant |
| relaxers | relaxing |
| relaxins | relaxable |
| relaxants | relaxedly |
| relaxation | relaxations |
| relaxedness | relaxednesses |
Note: These 16 words that start with 'relax' are found from the USA & Canada version of the tournament Scrabble word list.