There are 20 8-letter words that end with 'tness'.
| curtness | daftness | deftness | meetness |
| lostness | mootness | gastness | fastness |
| flatness | justness | neatness | saltness |
| pastness | pertness | softness | raptness |
| tartness | tautness | vastness | whatness |
Note: These 20 8-letter words that end with 'tness' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with ntness, ctness, rtness, stness, htness, itness, etness, ptness, atness, ftness, utness, ltness, otness.
7-letter words end with 'tness' (7)