There are 13 words that start with 'prewa'.
| prewar | prewarm | prewarn |
| prewash | prewarms | prewarns |
| prewarmed | prewarned | prewashed |
| prewashes | prewarming | prewarning |
| prewashing | ||
Note: These 13 words that start with 'prewa' are found from the USA & Canada version of the tournament Scrabble word list.