There are 3 13-letter words that end with 'ain'.
| intermountain | semiporcelain |
| transmountain | |
Note: These 3 13-letter words that end with 'ain' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with rain, tain, lain, main, wain, gain, hain, dain, pain, cain, sain, vain, bain, fain, kain, uain.
4-letter words end with 'ain' (12)