Overlad or Overlaid: How To spell?

The word Overlad is misspelled against Overlaid, which is past tense of "Overlay"

Word contains consecutive vowels 'AI' in between alphabets overl & d is misspelled as 'A'
Wrong Spelling:  overl-a-d 
Correct Spelling:  overl-ai-d 
Explore spell check of Overlaid to spell without errors.

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