There are 13 words that start with 'septi'.
| septic | septics | septime |
| septical | septimes | septicity |
| septicemia | septicemic | septicidal |
| septillion | septicemias | septicities |
| septillions | ||
Note: These 13 words that start with 'septi' are found from the USA & Canada version of the tournament Scrabble word list.