There are 41 words that end with 'proof'.
Note: These 41 words that end with 'proof' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with rproof, tproof, dproof, eproof, nproof, kproof, lproof, hproof, bproof, mproof, sproof, yproof.