There are 11 words that start with 'backwa'.
| backward | backwash |
| backwards | backwater |
| backwardly | backwashed |
| backwashes | backwaters |
| backwashing | backwardness |
| backwardnesses | |
Note: These 11 words that start with 'backwa' are found from the USA & Canada version of the tournament Scrabble word list.