There are 10 words that start with 'prosth'.
| prostheses | prosthesis |
| prosthetic | prosthetics |
| prosthetist | prosthetists |
| prosthetically | prosthodontics |
| prosthodontist | prosthodontists |
Note: These 10 words that start with 'prosth' are found from the USA & Canada version of the tournament Scrabble word list.