Rufing or Ruffing: How To spell?
The word Rufing is misspelled against Ruffing, which is present continuous of "Ruff"
Ruffing has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Ru & ing which should not be misspelled with single 'F'
Wrong Spelling:  Ru-f-ing  Correct Spelling:  Ru-ff-ing 
Check more misspelled words of Ruffing to spell it correct.