There are 18 words that start with 'begu'.
| begum | begun | begulf | 
| begums | beguile | beguine | 
| begulfs | beguiled | beguiler | 
| beguiles | beguines | begulfed | 
| beguilers | beguiling | begulfing | 
| beguilement | beguilingly | beguilements | 
Note: These 18 words that start with 'begu' are found from the USA & Canada version of the tournament Scrabble word list.