There are 14 11-letter words that start with 'bes'.
| bescorching | bescreening | beshadowing | 
| beshivering | beshrouding | besmirching | 
| besmoothing | bespangling | bespattered | 
| bespreading | besprinkled | besprinkles | 
| bestialized | bestializes | |
Note: These 14 11-letter words that start with 'bes' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with best, besm, besp, besh, bese, besc, beso, besi, besl, besn, besw.
4-letter words start with 'bes' (1)