The word Diseysing is misspelled against Diseasing, which is present continuous of "Disease"
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Diseasing has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets dis & sing is misspelled as 'EY'
Wrong Spelling:  dis-ey-sing 
Correct Spelling:  dis-ea-sing 
Find more wrongly spelled words of Diseasing to spell it well.