The word Fortreses is misspelled against Fortresses, which is plural of "Fortress"
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Fortresses has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings fortre & es which should not be misspelled with single 'S'
Wrong Spelling: fortre-s-es
Correct Spelling: fortre-ss-es
Find more incorrect spellings of Fortresses to spell right way.