There are 11 words that start with 'mummi'.
| mummied | mummies | 
| mummify | mumming | 
| mummichog | mummified | 
| mummifies | mummichogs | 
| mummifying | mummification | 
| mummifications | |
Note: These 11 words that start with 'mummi' are found from the USA & Canada version of the tournament Scrabble word list.