There are 13 words that start with 'pust'.
| pustule | pustular | pustuled |
| pustules | pustulant | pustulate |
| pustulous | pustulants | pustulated |
| pustulates | pustulating | pustulation |
| pustulations | ||
Note: These 13 words that start with 'pust' are found from the USA & Canada version of the tournament Scrabble word list.