Reos or Rais: How To spell?

The word Reos is misspelled against Rais, a noun meaning "Same as 2d Reis."

Word contains consecutive vowels 'AI' in between alphabets r & s is misspelled as 'EO'
Wrong Spelling:  r-eo-s 
Correct Spelling:  r-ai-s 
Find more incorrect spellings of Rais to spell right way.

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