There are 19 words that start with 'thread'.
| thread | threads |
| thready | threaded |
| threader | threaders |
| threadfin | threadier |
| threading | threadbare |
| threadfins | threadiest |
| threadless | threadlike |
| threadworm | threadiness |
| threadworms | threadinesses |
| threadbareness | |
Note: These 19 words that start with 'thread' are found from the USA & Canada version of the tournament Scrabble word list.