There are 14 words that start with 'bumb'.
| bumble | bumbled | bumbler |
| bumbles | bumboat | bumblers |
| bumbling | bumboats | bumblebee |
| bumblings | bumblebees | bumblingly |
| bumbershoot | bumbershoots | |
Note: These 14 words that start with 'bumb' are found from the USA & Canada version of the tournament Scrabble word list.