There are 51 words that end with 'down'.
Note: These 51 words that end with 'down' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with edown, tdown, kdown, wdown, ndown, ddown, hdown, bdown, ldown, rdown, adown, gdown, odown, pdown, sdown, ydown.