There are 14 words that start with 'thw'.
| thwack | thwart | thwacks |
| thwarts | thwacked | thwacker |
| thwarted | thwarter | thwartly |
| thwackers | thwacking | thwarters |
| thwarting | thwartwise | |
Note: These 14 words that start with 'thw' are found from the USA & Canada version of the tournament Scrabble word list.