There is 1 15-letter word that end with 'tis'.
| gastroenteritis | |
Note: These 1 15-letter words that end with 'tis' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with itis, atis, ttis, utis, ntis, otis, stis, etis, rtis, ftis, ktis, ytis.
5-letter words end with 'tis' (10)