Hairdreser or Hairdresser: How To spell?
The word Hairdreser is misspelled against Hairdresser, a noun meaning "One who dresses or cuts hair; a barber."
Hairdresser has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings hairdre & er which should not be misspelled with single 'S'
Wrong Spelling:  hairdre-s-er  Correct Spelling:  hairdre-ss-er 
Find more wrongly spelled words of Hairdresser to spell it well.