The word Thrumed is misspelled against Thrummed, which is past tense of "Thrum"
-->
Thrummed has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings thru & ed which should not be misspelled with single 'M'
Wrong Spelling:  thru-m-ed 
Correct Spelling:  thru-mm-ed 
Check more misspelled words of Thrummed to spell it correct.