Mammoth Uncensored Word List:
37 words ending with ff, 5 letters long

blaff bluff chaff chuff cliff cloff draff feoff flaff fluff gliff graff griff gruff houff howff nyaff pluff pouff quaff quiff scaff scoff scuff skiff skoff sluff sniff snuff sowff spiff staff stiff stuff triff wauff whiff