There are 6 15-letter words that end with 'osis'.
| agranulocytosis | ariboflavinosis |
| atherosclerosis | hemochromatosis |
| immunodiagnosis | strongyloidosis |
Note: These 6 15-letter words that end with 'osis' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with tosis, nosis, rosis, iosis, losis, hosis, cosis, mosis, dosis, eosis, gosis, yosis, posis, bosis, kosis, oosis.
6-letter words end with 'osis' (7)