There are 8 13-letter words that start with 'thr'.
| thrasonically | threadinesses |
| threateningly | thriftinesses |
| throatinesses | throatlatches |
| thrombokinase | throttleholds |
Note: These 8 13-letter words that start with 'thr' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with thro, thre, thri, thra, thru.
4-letter words start with 'thr' (2)