Cysson or Caisson: How To spell?

The word Cysson is misspelled against Caisson, a noun meaning "A chest filled with explosive materials, to be laid in the way of an enemy and exploded on his approach."

Word contains consecutive vowels 'AI' in between alphabets c & sson is misspelled as 'Y'
Wrong Spelling: c-y-sson
Correct Spelling: c-ai-sson
Find more incorrect spellings of Caisson to spell right way.