Canvaser or Canvasser: How To spell?
The word Canvaser is misspelled against Canvasser, a noun meaning "One who canvasses."
Canvasser has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings canva & er which should not be misspelled with single 'S'
Wrong Spelling:  canva-s-er  Correct Spelling:  canva-ss-er 
Explore spell check of Canvasser to spell without errors.