There are 134 9-letter words that end with 'os'.
Note: These 134 9-letter words that end with 'os' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with tos, ros, dos, nos, los, oos, gos, ios, mos, cos, hos, bos, sos, pos, kos, zos, eos, vos, aos, yos, jos, fos, uos, wos.
3-letter words end with 'os' (10)