The word Casing is misspelled against Ceasing, which is present continuous of "Cease"
-->
Ceasing has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets c & sing is misspelled as 'A'
Wrong Spelling:  c-a-sing 
Correct Spelling:  c-ea-sing 
Find more wrongly spelled words of Ceasing to spell it well.