There are 15 words that start with 'stac'.
| stack | stacks | stacte |
| stacked | stacker | stackup |
| stactes | staccati | staccato |
| stackers | stacking | stackups |
| staccatos | stackable | stackless |
Note: These 15 words that start with 'stac' are found from the USA & Canada version of the tournament Scrabble word list.