The word Misafirm is misspelled against Misaffirm, a verb meaning "To affirm incorrectly."
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Misaffirm has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Misa & irm which should not be misspelled with single 'F'
Wrong Spelling:  Misa-f-irm 
Correct Spelling:  Misa-ff-irm 
Find more wrongly spelled words of Misaffirm to spell it well.