There are 12 15-letter words that start with 'supers'.
| supersaturating | supersaturation |
| superscriptions | superspecialist |
| superspectacles | superstimulated |
| superstimulates | superstitiously |
| superstructural | superstructures |
| supersubtleties | supersymmetries |
Note: These 12 15-letter words that start with 'supers' are found from the USA & Canada version of the tournament Scrabble word list.