The word Piling is misspelled against Pilling, which is present continuous of "Pill"
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Pilling has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings pi & ing which should not be misspelled with single 'L'
Wrong Spelling: pi-l-ing
Correct Spelling: pi-ll-ing
Find more wrongly spelled words of Pilling to spell it well.