There are 18 words that start with 'lef'.
| left | lefts | lefty |
| lefter | leftest | lefties |
| leftish | leftism | leftist |
| leftisms | leftists | leftmost |
| leftover | leftward | leftwing |
| leftmosts | leftovers | leftwards |
Note: These 18 words that start with 'lef' are found from the USA & Canada version of the tournament Scrabble word list.