There are 10 words that start with 'unthr'.
| unthread | unthrone |
| unthreads | unthrifty |
| unthroned | unthrones |
| unthreaded | unthroning |
| unthreading | unthreatening |
Note: These 10 words that start with 'unthr' are found from the USA & Canada version of the tournament Scrabble word list.