The word Mispeech is misspelled against Misspeech, a noun meaning "Wrong speech."
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Misspeech has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings mi & peech which should not be misspelled with single 'S'
Wrong Spelling:  mi-s-peech 
Correct Spelling:  mi-ss-peech 
Find more wrongly spelled words of Misspeech to spell it well.