Stuming or Stumming: How To spell?

The word Stuming is misspelled against Stumming, which is present continuous of "Stum"

Stumming has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings stu & ing which should not be misspelled with single 'M'
Wrong Spelling: stu-m-ing
Correct Spelling: stu-mm-ing
Check more misspelled words of Stumming to spell it correct.