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.