There are 12 words that start with 'flac'.
| flack | flacks | flacon | 
| flaccid | flacked | flacons | 
| flackery | flacking | flaccidly | 
| flaccidity | flackeries | flaccidities | 
Note: These 12 words that start with 'flac' are found from the USA & Canada version of the tournament Scrabble word list.