There are 15 words that start with 'hepta'.
| heptad | heptads | heptane |
| heptagon | heptanes | heptarch |
| heptagons | heptarchs | heptarchy |
| heptachlor | heptagonal | heptameter |
| heptachlors | heptameters | heptarchies |
Note: These 15 words that start with 'hepta' are found from the USA & Canada version of the tournament Scrabble word list.