There are 13 words that end with 'ckness'.
| packness | sickness |
| blackness | slackness |
| slickness | quickness |
| thickness | airsickness |
| seasickness | homesickness |
| lovesickness | greensickness |
| heartsickness | |
Note: These 13 words that end with 'ckness' are found from the USA & Canada version of the tournament Scrabble word list.