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