There are 10 11-letter words that start with 'sle'.
| sleazeballs | sleeknesses | sleeplessly | 
| sleepwalked | sleepwalker | sleepyheads | 
| slenderized | slenderizes | slenderness | 
| sleuthhound | ||
Note: These 10 11-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)