There are 7 12-letter words that start with 'sle'.
| sleazinesses | sledgehammer | sleepinesses | 
| sleepwalkers | sleepwalking | slenderizing | 
| sleuthhounds | ||
Note: These 7 12-letter words that start with 'sle' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with slee, slea, sled, slen, slei, sleu, slew, slep.
4-letter words start with 'sle' (2)