Duff :: Duff (n.) A stiff flour pudding, boiled in a bag; -- a term used especially by seamen; as, plum duff..
Duffel :: Duffel (n.) A kind of coarse woolen cloth, having a thick nap or frieze..
Duffer :: Duffer (n.) A peddler or hawker, especially of cheap, flashy articles, as sham jewelry; hence, a sham or cheat..
Duffer :: Duffer (n.) A stupid, awkward, inefficient person..