Boya or Boyau: How To spell?

The word Boya 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 'A' as letter 'U' is phonetically ignored
Wrong Spelling: boy-a
Correct Spelling: boy-au
Find more incorrect spellings of Boyau to spell right way.