Knobing or Knobbing: How To spell?
The word Knobing is misspelled against Knobbing, a noun meaning "Rough dressing by knocking off knobs or projections."
Knobbing has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Kno & ing which should not be misspelled with single 'B'
Wrong Spelling:  Kno-b-ing  Correct Spelling:  Kno-bb-ing 
Find more incorrect spellings of Knobbing to spell right way.