There are 8 12-letter words that start with 'sul'.
| sulfadiazine | sulfonamides | sulfonations |
| sulfonylurea | sulfuretting | sullennesses |
| sulphurising | sultrinesses | |
Note: These 8 12-letter words that start with 'sul' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with sulf, sulp, sult, sulk, sull, sulc, suld, sulu.
4-letter words start with 'sul' (2)