There are 20 words that start with 'sett'.
| sett | setts | settee | 
| setter | settle | settees | 
| setters | setting | settled | 
| settler | settles | settlor | 
| settings | settlers | settling | 
| settlors | settlings | settleable | 
| settlement | settlements | |
Note: These 20 words that start with 'sett' are found from the USA & Canada version of the tournament Scrabble word list.