Mammoth Uncensored Word List:
32 words ending with of, 9 letters long

acidproof babyproof bombproof dustproof evilproof fireproof foolproof germproof gnatproof goofproof hailproof heatproof horsehoof leakproof mothproof nailproof ovenproof overproof pickproof rainproof rustproof sandproof seepproof skidproof slipproof snowproof sootproof tearproof wartproof waveproof wearproof windproof