There are 6 10-letter words that start with 'ble'.
| bleachable | bleariness | blemishers | 
| blemishing | blessedest | blethering | 
Note: These 6 10-letter words that start with 'ble' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with blea, blen, bles, blee, blem, blet, bleb, blep, blel, bled, blew.
4-letter words start with 'ble' (4)