There are 13 words that start with 'willi'.
| willie | willied |
| willies | willing |
| williwau | williwaw |
| willinger | willingly |
| williwaus | williwaws |
| willingest | willingness |
| willingnesses | |
Note: These 13 words that start with 'willi' are found from the USA & Canada version of the tournament Scrabble word list.