There are 14 words that start with 'quac'.
| quack | quacks | quacky |
| quacked | quackery | quackier |
| quacking | quackish | quackism |
| quackiest | quackisms | quackeries |
| quacksalver | quacksalvers | |
Note: These 14 words that start with 'quac' are found from the USA & Canada version of the tournament Scrabble word list.