Feiled or Failed: How To spell?

The word Feiled is misspelled against Failed, which is past tense of "Fail"

Word contains consecutive vowels 'AI' in between alphabets f & led is misspelled as 'EI'
Wrong Spelling:  f-ei-led 
Correct Spelling:  f-ai-led 
Find more wrongly spelled words of Failed to spell it well.

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