Ascertuner or Ascertainer: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets ascert & ner is misspelled as 'U'
Wrong Spelling:  ascert-u-ner 
Correct Spelling:  ascert-ai-ner 
Check more misspelled words of Ascertainer to spell it correct.

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