There are 17 words that start with 'choi'.
| choir | choice | choirs | 
| choicer | choices | choired | 
| choicely | choicest | choirboy | 
| choiring | choirboys | choirgirl | 
| choiceness | choirgirls | choirmaster | 
| choicenesses | choirmasters | |
Note: These 17 words that start with 'choi' are found from the USA & Canada version of the tournament Scrabble word list.