Thruming or Thrumming: How To spell?

The word Thruming is misspelled against Thrumming, which is present continuous of "Thrum"

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