Certonness or Certainness: How To spell?

The word Certonness is misspelled against Certainness, a noun meaning "Certainty."

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

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