There are 11 words that start with 'sump'.
| sump | sumps |
| sumpter | sumpters |
| sumpweed | sumptuary |
| sumptuous | sumpweeds |
| sumptuously | sumptuousness |
| sumptuousnesses | |
Note: These 11 words that start with 'sump' are found from the USA & Canada version of the tournament Scrabble word list.