There are 14 words that start with 'sneak'.
| sneak | sneaks | sneaky | 
| sneaked | sneaker | sneakers | 
| sneakier | sneakily | sneaking | 
| sneakered | sneakiest | sneakiness | 
| sneakingly | sneakinesses | |
Note: These 14 words that start with 'sneak' are found from the USA & Canada version of the tournament Scrabble word list.