There are 10 words that start with 'septu'.
| septum | septums |
| septuple | septupled |
| septuples | septuplet |
| septuplets | septupling |
| septuagenarian | septuagenarians |
Note: These 10 words that start with 'septu' are found from the USA & Canada version of the tournament Scrabble word list.