There are 17 words that start with 'deform'.
| deform | deforms | 
| deformed | deformer | 
| deformers | deforming | 
| deformity | deformable | 
| deformalize | deformation | 
| deformative | deformities | 
| deformalized | deformalizes | 
| deformations | deformalizing | 
| deformational | |
Note: These 17 words that start with 'deform' are found from the USA & Canada version of the tournament Scrabble word list.