There are 16 words that end with 'rtness'.
| curtness | pertness | tartness |
| alertness | apartness | inertness |
| peartness | shortness | smartness |
| overtness | swartness | covertness |
| expertness | malapertness | inexpertness |
| stalwartness | ||
Note: These 16 words that end with 'rtness' are found from the USA & Canada version of the tournament Scrabble word list.