There are 10 words that start with 'kook'.
| kook | kooks | kooky |
| kookie | kookier | kookiest |
| kookiness | kookaburra | kookaburras |
| kookinesses | ||
Note: These 10 words that start with 'kook' are found from the USA & Canada version of the tournament Scrabble word list.