Boyua or Boyau: How To spell?

The word Boyua is misspelled against Boyau, a noun meaning "A winding or zigzag trench forming a path or communication from one siegework to another, to a magazine, etc."

Word ends with consecutive vowels 'AU' preceded by alphabets 'boy' is misspelled as 'UA'
Wrong Spelling:  boy-ua 
Correct Spelling:  boy-au 
Check more misspelled words of Boyau to spell it correct.

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