Prevalment or Prevailment: How To spell?

The word Prevalment is misspelled against Prevailment, a noun meaning "Prevalence; superior influence; efficacy."

Word contains consecutive vowels 'AI' in between alphabets prev & lment is misspelled as 'A'
Wrong Spelling:  prev-a-lment 
Correct Spelling:  prev-ai-lment 
Explore spell check of Prevailment to spell without errors.

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