Stubing or Stubbing: How To spell?
The word Stubing is misspelled against Stubbing, which is present continuous of "Stub"
Stubbing has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Stu & ing which should not be misspelled with single 'B'
Wrong Spelling:  Stu-b-ing  Correct Spelling:  Stu-bb-ing 
Check more misspelled words of Stubbing to spell it correct.