There are 9 words that start with 'slippe'.
| slipped | slipper | 
| slippers | slippery | 
| slippered | slipperier | 
| slipperiest | slipperiness | 
| slipperinesses | |
Note: These 9 words that start with 'slippe' are found from the USA & Canada version of the tournament Scrabble word list.