There are 18 words that start with 'jump'.
| jump | jumps | jumpy |
| jumped | jumper | jumpers |
| jumpier | jumpily | jumping |
| jumpoff | jumpable | jumpiest |
| jumpoffs | jumpsuit | jumpiness |
| jumpingly | jumpsuits | jumpinesses |
Note: These 18 words that start with 'jump' are found from the USA & Canada version of the tournament Scrabble word list.