The word Sempstresy is misspelled against Sempstressy, a noun meaning "Seamstressy."
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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.