There are 8 13-letter words that start with 'supp'.
| supplantation | supplementals |
| supplementary | supplementers |
| supplementing | supplications |
| suppositional | suppositories |
Note: These 8 13-letter words that start with 'supp' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with suppl, suppo, suppr, suppu, suppe, suppi.
6-letter words start with 'supp' (4)