There are 18 words that start with 'sleek'.
| sleek | sleeks | sleeky | 
| sleeked | sleeken | sleeker | 
| sleekit | sleekly | sleekens | 
| sleekers | sleekest | sleekier | 
| sleeking | sleekened | sleekiest | 
| sleekness | sleekening | sleeknesses | 
Note: These 18 words that start with 'sleek' are found from the USA & Canada version of the tournament Scrabble word list.