Negreses or Negresses: How To spell?
The word Negreses is misspelled against Negresses, which is plural of "Negress"
Negresses has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings negre & es which should not be misspelled with single 'S'
Wrong Spelling:  negre-s-es  Correct Spelling:  negre-ss-es 
Explore spell check of Negresses to spell without errors.