There are 13 11-letter words that start with 'cas'.
| cascarillas | casebearers | caseworkers |
| cassiterite | cassowaries | castability |
| castellated | castigating | castigation |
| castigators | castrations | casuistical |
| casuistries | ||
Note: These 13 11-letter words that start with 'cas' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with cast, case, cass, cash, casu, casc, casi, cask, casa, casq, casb.
4-letter words start with 'cas' (5)