There are 13 words that start with 'umbel'.
| umbel | umbels |
| umbeled | umbellar |
| umbelled | umbellet |
| umbellate | umbellets |
| umbellule | umbellifer |
| umbellules | umbellifers |
| umbelliferous | |
Note: These 13 words that start with 'umbel' are found from the USA & Canada version of the tournament Scrabble word list.