Guesing or Guessing: How To spell?
The word Guesing is misspelled against Guessing, which is present continuous of "Guess"
Guessing has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings gue & ing which should not be misspelled with single 'S'
Wrong Spelling:  gue-s-ing  Correct Spelling:  gue-ss-ing 
Check more misspelled words of Guessing to spell it correct.