Decaising or Deceasing: How To spell?

The word Decaising is misspelled against Deceasing, which is present continuous of "Decease"

Deceasing has vowels 'ea' together mispronounced as 'ai'
Word contains consecutive vowels 'EA' in between alphabets dec & sing is misspelled as 'AI'
Wrong Spelling:  dec-ai-sing 
Correct Spelling:  dec-ea-sing 
Find more wrongly spelled words of Deceasing to spell it well.

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