There are 14 words that start with 'pump'.
| pump | pumps |
| pumped | pumper |
| pumpers | pumping |
| pumpkin | pumpkins |
| pumpless | pumplike |
| pumpkinseed | pumpernickel |
| pumpkinseeds | pumpernickels |
Note: These 14 words that start with 'pump' are found from the USA & Canada version of the tournament Scrabble word list.