Retonment or Retainment: How To spell?

The word Retonment is misspelled against Retainment, a noun meaning "The act of retaining; retention."

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

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