There are 137 15-letter words that end with 'ts'.
Note: These 137 15-letter words that end with 'ts' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with sts, nts, ets, ats, its, ots, rts, cts, uts, hts, lts, fts, pts, tts, xts, bts, wts, dts, yts.
3-letter words end with 'ts' (2)