There are 14 words that end with 'mness'.
dimness | calmness |
glumness | grimness |
firmness | slimness |
primness | trimness |
warmness | buxomness |
randomness | uniformness |
lukewarmness | nonrandomness |
Note: These 14 words that end with 'mness' are found from the USA & Canada version of the tournament Scrabble word list.