There are 25 11-letter words that start with 'san'.
Note: These 25 11-letter words that start with 'san' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with sand, sani, sant, sang, sanc, sans, sane, sann, sana, sanb, sanj, sank.
4-letter words start with 'san' (5)