Plateaax or Plateaux: How To spell?

The word Plateaax is misspelled against Plateaux, which is plural of "Plateau"

Word contains consecutive vowels 'AU' in between alphabets plate & x is misspelled as 'AA'
Wrong Spelling:  plate-aa-x 
Correct Spelling:  plate-au-x 
Explore spell check of Plateaux to spell without errors.

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