There are 11 13-letter words that end with 'tises'.
| mastoiditises | myocarditises |
| pneumonitises | salpingitises |
| periostitises | peritonitises |
| spondylitises | prostatitises |
| stephanotises | thyroiditises |
| tonsillitises | |
Note: These 11 13-letter words that end with 'tises' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with itises, atises, etises, rtises, otises, stises, ttises, utises, ytises, ctises, ntises, ptises.
7-letter words end with 'tises' (3)