Perment or Pairment: How To spell?

The word Perment is misspelled against Pairment, a noun meaning "Impairment."

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

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