Duf or Duff: How To spell?
The word Duf is misspelled against Duff, a noun meaning "A stiff flour pudding, boiled in a bag; -- a term used especially by seamen; as, plum duff."
Duff has double 'ff' in the end mispronounced as 'f'Remember double 'FF' appears in the end of this word which should not be misspelled with single 'F'
Wrong Spelling:  du-f  Correct Spelling:  du-ff 
Check more misspelled words of Duff to spell it correct.