Ascertener or Ascertainer: How To spell?

The word Ascertener is misspelled against Ascertainer, a noun meaning "One who ascertains."

Word contains consecutive vowels 'AI' in between alphabets ascert & ner is misspelled as 'E'
Wrong Spelling:  ascert-e-ner 
Correct Spelling:  ascert-ai-ner 
Explore spell check of Ascertainer to spell without errors.

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