There are 19 words that start with 'begr'.
| begrim | begrime | begrims | 
| begroan | begrimed | begrimes | 
| begroans | begrudge | begriming | 
| begrimmed | begroaned | begrudged | 
| begrudger | begrudges | begrimming | 
| begroaning | begrudgers | begrudging | 
| begrudgingly | ||
Note: These 19 words that start with 'begr' are found from the USA & Canada version of the tournament Scrabble word list.