Gonsay or Gainsay: How To spell?

The word Gonsay is misspelled against Gainsay, meaning "to deny to oppose"

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

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