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