There are 15 words that start with 'umbr'.
| umbra | umbrae |
| umbral | umbras |
| umbrage | umbrages |
| umbrella | umbrette |
| umbrellas | umbrettes |
| umbrageous | umbrellaed |
| umbrellaing | umbrageously |
| umbrageousness | |
Note: These 15 words that start with 'umbr' are found from the USA & Canada version of the tournament Scrabble word list.