Retenment or Retainment: How To spell?

The word Retenment 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 'E'
Wrong Spelling:  ret-e-nment 
Correct Spelling:  ret-ai-nment 
Explore spell check of Retainment to spell without errors.

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