There are 17 9-letter words that start with 'sep'.
| separable | separably | separated |
| separates | separator | sepiolite |
| septarian | septarium | septenary |
| septettes | septicity | septupled |
| septuples | septuplet | sepulcher |
| sepulchre | sepulture | |
Note: These 17 9-letter words that start with 'sep' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with sept, sepa, sepu, sepi, sepo, sepp, seps.
4-letter words start with 'sep' (1)