Deroling or Derailing: How To spell?

The word Deroling is misspelled against Derailing, which is present continuous of "Derail"

Word contains consecutive vowels 'AI' in between alphabets der & ling is misspelled as 'O'
Wrong Spelling:  der-o-ling 
Correct Spelling:  der-ai-ling 
Find more incorrect spellings of Derailing to spell right way.

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