Rideao or Rideau: How To spell?

The word Rideao is misspelled against Rideau, a noun meaning "A small mound of earth; ground slightly elevated; a small ridge."

Word ends with consecutive vowels 'AU' preceded by alphabets 'ride' is misspelled as 'AO'
Wrong Spelling:  ride-ao 
Correct Spelling:  ride-au 
Find more incorrect spellings of Rideau to spell right way.

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