The word Quizing is misspelled against Quizzing, which is present continuous of "Quiz"
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Quizzing has double "zz" is mispronounced as "z"
Remember double 'ZZ' in between the strings qui & ing which should not be misspelled with single 'Z'
Wrong Spelling: qui-z-ing
Correct Spelling: qui-zz-ing
Check more misspelled words of Quizzing to spell it correct.