Boyu or Boyau: How To spell?

The word Boyu 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 end with consecutive vowels 'AU' preceded by alphabets 'boy' is misspelled as 'U' as letter 'A' is phonetically ignored
Wrong Spelling: boy-u
Correct Spelling: boy-au
Check more misspelled words of Boyau to spell it correct.