There are 12 words that start with 'tumu'.
| tumuli | tumult |
| tumular | tumults |
| tumulus | tumulose |
| tumulous | tumuluses |
| tumultuary | tumultuous |
| tumultuously | tumultuousness |
Note: These 12 words that start with 'tumu' are found from the USA & Canada version of the tournament Scrabble word list.