Overpead or Overpaid: How To spell?

The word Overpead is misspelled against Overpaid, which is past tense of "Overpay"

Word contains consecutive vowels 'AI' in between alphabets overp & d is misspelled as 'EA'
Wrong Spelling:  overp-ea-d 
Correct Spelling:  overp-ai-d 
Explore spell check of Overpaid to spell without errors.

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