Ciasson or Caisson: How To spell?

The word Ciasson 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 'IA'
Wrong Spelling:  c-ia-sson 
Correct Spelling:  c-ai-sson 
Find more incorrect spellings of Caisson to spell right way.

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