There are 15 words that start with 'begi'.
| begin | begins | begird | 
| begirt | begirds | beginner | 
| begirded | begirdle | beginners | 
| beginning | begirding | begirdled | 
| begirdles | beginnings | begirdling | 
Note: These 15 words that start with 'begi' are found from the USA & Canada version of the tournament Scrabble word list.