Batardeaw or Batardeau: How To spell?

The word Batardeaw is misspelled against Batardeau, a noun meaning "A cofferdam."

Word ends with consecutive vowels 'AU' preceded by alphabets 'batarde' is misspelled as 'AW'
Wrong Spelling:  batarde-aw 
Correct Spelling:  batarde-au 
Explore spell check of Batardeau to spell without errors.

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