There are 15 words that end with 'titis'.
| titis | otitis |
| cystitis | mastitis |
| hepatitis | keratitis |
| parotitis | ouistitis |
| proctitis | dermatitis |
| stomatitis | periostitis |
| prostatitis | pancreatitis |
| cholecystitis | |
Note: These 15 words that end with 'titis' are found from the USA & Canada version of the tournament Scrabble word list.