Rus or Rais: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets r & s is misspelled as 'U'
Wrong Spelling:  r-u-s 
Correct Spelling:  r-ai-s 
Check more misspelled words of Rais to spell it correct.

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