There are 15 words that start with 'tread'.
| tread | treads | treaded |
| treader | treadle | treaders |
| treading | treadled | treadler |
| treadles | treadlers | treadless |
| treadling | treadmill | treadmills |
Note: These 15 words that start with 'tread' are found from the USA & Canada version of the tournament Scrabble word list.