Caoser or Causer: How To spell?

The word Caoser is misspelled against Causer, a noun meaning "One who or that which causes."

Word contains consecutive vowels 'AU' in between alphabets c & ser is misspelled as 'AO'
Wrong Spelling:  c-ao-ser 
Correct Spelling:  c-au-ser 
Find more incorrect spellings of Causer to spell right way.

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